首先student类

package xuexi;
public class Student {

		private String stunumber;
		private String name;
		private double mathematicsscore;
		private double englishiscore;
		private double networkscore;
		private double databasescore;
		private double softwarescore;
		public Student(){}
		public Student(String stunumber,String name,float mathematicsscore,float englishiscore,float networkscore,float databasescore,float softwarescore){
			this.stunumber=stunumber;
			this.name=name;
			this.mathematicsscore=mathematicsscore;
			this.englishiscore=englishiscore;
			this.networkscore=networkscore;
			this.databasescore=databasescore;
			this.softwarescore=softwarescore;

}
		public String getstunumber(){
			return stunumber;
		}
		public void setstunumber(String getstunumber){
			this.stunumber=stunumber;
		}
		public String getname(){
			return name;
		}
		public void setname(String name){
			this.name=name;
		}
		public double getmathematicsscore() {
			return mathematicsscore;
		}
		public void setmathematicsscore(double x1) {
			this.mathematicsscore = x1;
		}
		public double getenglishiscore() {
			return englishiscore;
		}
		public void setenglishiscore(double d) {
			this.englishiscore = d;
		}
		public double getdatabasescore() {
			return databasescore;
		}
		public void setdatabasescore(double d) {
			this.databasescore = d;
		}
		public double getnetworkscore() {
			return networkscore;
		}
		public void setnetworkscore(double d) {
			this.networkscore = d;
		}
		public double getsoftwarescore() {
			return softwarescore;
		}
		public void setsoftwarescore(double x5) {
			this.softwarescore = x5;
		}
	}然后是xuexi类
package xuexi;
import java.util.Scanner;
import xuexi.Student;
public class Helo {
	static Scanner sc = new Scanner(System.in);
	static Student s[] = new  Student[100];
    static int n=0;
	public static void meun()
	{	
		 System.out.println("***********************************************************");
	     System.out.println("                 石家庄铁道大学软件工程系                                   ");
	     System.out.println("                 学生学籍管理系统 2019 版                                  ");
	     System.out.println("***********************************************************");
	     System.out.println("                 1、 学生考试成绩录入                                  ");
	     System.out.println("                 2、 学生考试成绩修改                                ");
	     System.out.println("                 3、 计算学生成绩绩点                                 ");
	     System.out.println("                 4、 退出学籍管理系统                                 ");
	     System.out.println("***********************************************************");
	     System.out.println("请选择。。。");
	     int t=sc.nextInt();
	     switch(t)
	     {
	     case 1:luru();break;
	     case 2:xiuga();break;
	     case 3:jisuan();break;
	     case 4:tuichu();break;
	     default :System.out.println("请重新输入。。。");meun();break;
	     }
	     }public static void kaishi()
	{int i=0;
	for(i=0;i<5;i++)
	{
		s[i]=new Student();
	}
		  s[0] = new Student();
		  s[0].setstunumber("20183617");
		  s[0].setname("孙鸿滨");
		  s[0].setmathematicsscore(0);
		  s[0].setenglishiscore(0);
		  s[0].setnetworkscore(0);
		  s[0].setdatabasescore(0);
		  s[0].setsoftwarescore(0);
		  s[1] = new Student();
		  s[1].setstunumber("20181234");
		  s[1].setname("张三");
		  s[1].setmathematicsscore(0);
		  s[1].setenglishiscore(0);
		  s[1].setnetworkscore(0);
		  s[1].setdatabasescore(0);
		  s[1].setsoftwarescore(0);
		  s[2] = new Student();
		  s[2].setstunumber("20185647");
		  s[2].setname("李四");
		  s[2].setmathematicsscore(0);
		  s[2].setenglishiscore(0);
		  s[2].setnetworkscore(0);
		  s[2].setdatabasescore(0);
		  s[2].setsoftwarescore(0);
		  s[3] = new Student();
		  s[3].setstunumber("20181245");
		  s[3].setname("王五");
		  s[3].setmathematicsscore(0);
		  s[3].setenglishiscore(0);
		  s[3].setnetworkscore(0);
		  s[3].setdatabasescore(0);
		  s[3].setsoftwarescore(0);
		  s[4] = new Student();
		  s[4].setstunumber("20183355");
		  s[4].setname("李六");
		  s[4].setmathematicsscore(0);
		  s[4].setenglishiscore(0);
		  s[4].setnetworkscore(0);
		  s[4].setdatabasescore(0);
		  s[4].setsoftwarescore(0);
}
	public static void tuichu()
	{
		System.out.println("****************************************************");
		System.out.println("     谢谢使用石家庄铁道大学软件工程系学生学籍管理系统2019版");
		System.out.println("                   制作人:孙鸿滨");
		System.out.println("****************************************************");
		System.exit(-1);
	}
	public static void luru()
	{
		while(true)
		{
		int t=0;
		System.out.println("*****************************************************" );
		System.out.println("        石家庄铁道大学软件工程系学生学籍管理系统2019版"   );
		System.out.println("               学生考试成绩录入界面"                     );
		System.out.println("****************************************************"  );
		System.out.println("               请输入学生学号:********");
		System.out.println("****************************************************");
		System.out.println("请输入八位的学号:");
		String a=sc.next();

		for(int i=0;i<n;i++)
		{
			if(a.equals(s[i].getstunumber()))
			{
				System.out.println("****************************************************");
				System.out.println("            石家庄铁道大学软件工程系学生学籍管理系统2019版");
				System.out.println("                     学生考试成绩录入界面");
				System.out.println("****************************************************");
				System.out.println("                 学生学号:"+s[i].getstunumber());
				System.out.println("                 学生姓名:"+s[i].getname());
				System.out.println("                 请输入高等数学成绩:");
				System.out.println("****************************************************");
				s[i].setmathematicsscore(sc.nextDouble());
				if(s[i].getmathematicsscore()>0&&s[i].getmathematicsscore()<=100)
				{
					System.out.println("****************************************************");
					System.out.println("            石家庄铁道大学软件工程系学生学籍管理系统2019版");
					System.out.println("                     学生考试成绩录入界面");
					System.out.println("****************************************************");
					System.out.println("                 学生学号:"+s[i].getstunumber());
					System.out.println("                 学生姓名:"+s[i].getname());
					System.out.println("                 高等数学成绩:"+s[i].getmathematicsscore());
					System.out.println("                 请输入大学英语成绩:");
					System.out.println("****************************************************");
					s[i].setenglishiscore(sc.nextDouble());
					if(s[i].getenglishiscore()>0&&s[i].getenglishiscore()<=100)
					{
						System.out.println("****************************************************");
						System.out.println("            石家庄铁道大学软件工程系学生学籍管理系统2019版");
						System.out.println("                     学生考试成绩录入界面");
						System.out.println("****************************************************");
						System.out.println("                 学生学号:"+s[i].getstunumber());
						System.out.println("                 学生姓名:"+s[i].getname());
						System.out.println("                 高等数学成绩:"+s[i].getmathematicsscore());
						System.out.println("                 大学英语成绩:"+s[i].getenglishiscore());
						System.out.println("                 请输入计算机网络成绩:");
						System.out.println("****************************************************");
						s[i].setnetworkscore(sc.nextDouble());
						if(s[i].getnetworkscore()>0&&s[i].getnetworkscore()<=100)
						{
							System.out.println("****************************************************");
							System.out.println("            石家庄铁道大学软件工程系学生学籍管理系统2019版");
							System.out.println("                     学生考试成绩录入界面");
							System.out.println("****************************************************");
							System.out.println("                 学生学号:"+s[i].getstunumber());
							System.out.println("                 学生姓名:"+s[i].getname());
							System.out.println("                 高等数学成绩:"+s[i].getmathematicsscore());
							System.out.println("                 大学英语成绩:"+s[i].getenglishiscore());
							System.out.println("                 计算机网络成绩:"+s[i].getnetworkscore());
							System.out.println("                 请输入数据库成绩:");
							System.out.println("****************************************************");
							s[i].setdatabasescore(sc.nextDouble());
							if(s[i].getdatabasescore()>0&&s[i].getdatabasescore()<100)
							{
								System.out.println("****************************************************");
								System.out.println("            石家庄铁道大学软件工程系学生学籍管理系统2019版");
								System.out.println("                     学生考试成绩录入界面");
								System.out.println("****************************************************");
								System.out.println("                 学生学号:"+s[i].getstunumber());
								System.out.println("                 学生姓名:"+s[i].getname());
								System.out.println("                 高等数学成绩:"+s[i].getmathematicsscore());
								System.out.println("                 大学英语成绩:"+s[i].getenglishiscore());
								System.out.println("                 计算机网络成绩:"+s[i].getnetworkscore());
								System.out.println("                 输入数据库成绩:"+s[i].getdatabasescore());
								System.out.println("                 请输入软件工程成绩:");
								System.out.println("****************************************************");
								s[i].setsoftwarescore(sc.nextDouble());
								if(s[i].getsoftwarescore()>0&&s[i].getsoftwarescore()<=100)
								{
									System.out.println("****************************************************");
									System.out.println("            石家庄铁道大学软件工程系学生学籍管理系统2019版");
									System.out.println("                     学生考试成绩录入界面");
									System.out.println("****************************************************");
									System.out.println("                 学生学号:"+s[i].getstunumber());
									System.out.println("                 学生姓名:"+s[i].getname());
									System.out.println("                 高等数学成绩:"+s[i].getmathematicsscore());
									System.out.println("                 大学英语成绩:"+s[i].getenglishiscore());
									System.out.println("                 计算机网络成绩:"+s[i].getnetworkscore());
									System.out.println("                 数据库成绩:"+s[i].getdatabasescore());
									System.out.println("                 软件工程成绩:"+s[i].getsoftwarescore());
									System.out.println("****************************************************");
									System.out.println("       该学生成绩已录入完毕,是否提交(Y/N)");
									String c=sc.next();
									if(c.equals("Y"))
										{
										   t=1;
										   break;
										}
									else 
									{
										s[i].setmathematicsscore(0);
										s[i].setenglishiscore(0);
										s[i].setnetworkscore(0);
										s[i].setdatabasescore(0);
										s[i].setsoftwarescore(0);
										break;
										}
									}
								else {t=0;break;}
							}
							else {t=0;break;}
						}
						else {t=0;break;}

					}
					else {t=0;break;}
				}
			}
			else if(i==n-1)System.out.println("该学号不存在");
		}
		if(t==1)break;
		}
	}
	public static void xiuga()
	{
		while(true)
		{
		System.out.println("****************************************************");
		System.out.println("            石家庄铁道大学软件工程系学生学籍管理系统2019版");
		System.out.println("                     学生考试成绩修改界面");
		System.out.println("****************************************************");
		System.out.println("                请输入学生学号:********");
		System.out.println("****************************************************");
		String a=sc.next();
		int i;
	    int m=0;

		for(i=0;i<n;i++)
		{
			if(a.equals(s[i].getstunumber()))
			{
				System.out.println("****************************************************");
				System.out.println("            石家庄铁道大学软件工程系学生学籍管理系统2019版");
				System.out.println("                     学生考试成绩修改界面");
				System.out.println("****************************************************");
				System.out.println("                 学生学号:"+s[i].getstunumber());
				System.out.println("                 学生姓名:"+s[i].getname());
				System.out.println("                 1.高等数学成绩:"+s[i].getmathematicsscore());
				System.out.println("                 2.大学英语成绩:"+s[i].getenglishiscore());
				System.out.println("                 3.计算机网络成绩:"+s[i].getnetworkscore());
				System.out.println("                 4.数据库成绩:"+s[i].getdatabasescore());
				System.out.println("                 5.软件工程成绩:"+s[i].getsoftwarescore());
				System.out.println("****************************************************");
				double x1,x2,x3,x4,x5;
				x1=s[i].getmathematicsscore();
				x2=s[i].getenglishiscore();
				x3=s[i].getnetworkscore();
				x4=s[i].getdatabasescore();
				x5=s[i].getsoftwarescore();
				System.out.println("请输入要修改的科目:");
				int t;
				t=sc.nextInt();
				switch(t)
				{
				case 1:
				   System.out.println("****************************************************");
				   System.out.println("            石家庄铁道大学软件工程系学生学籍管理系统2019版");
				   System.out.println("                     学生考试成绩修改界面");
				   System.out.println("****************************************************");
				   System.out.println("                 学生学号:"+s[i].getstunumber());
				   System.out.println("                 学生姓名:"+s[i].getname());
				   System.out.println("             请输入修改后的高等数学成绩:");
				   s[i].setmathematicsscore(sc.nextDouble());
				   break;
				case 2:
					   System.out.println("****************************************************");
					   System.out.println("            石家庄铁道大学软件工程系学生学籍管理系统2019版");
					   System.out.println("                     学生考试成绩修改界面");
					   System.out.println("****************************************************");
					   System.out.println("                 学生学号:"+s[i].getstunumber());
					   System.out.println("                 学生姓名:"+s[i].getname());
					   System.out.println("             请输入修改后的大学英语成绩:");
					   s[i].setenglishiscore(sc.nextDouble());
					   break;
				case 3:
					   System.out.println("****************************************************");
					   System.out.println("            石家庄铁道大学软件工程系学生学籍管理系统2019版");
					   System.out.println("                     学生考试成绩修改界面");
					   System.out.println("****************************************************");
					   System.out.println("                 学生学号:"+s[i].getstunumber());
					   System.out.println("                 学生姓名:"+s[i].getname());
					   System.out.println("             请输入修改后的计算机网络成绩:");
					   s[i].setnetworkscore(sc.nextDouble());
					   break;

				case 4:
					   System.out.println("****************************************************");
					   System.out.println("            石家庄铁道大学软件工程系学生学籍管理系统2019版");
					   System.out.println("                     学生考试成绩修改界面");
					   System.out.println("****************************************************");
					   System.out.println("                 学生学号:"+s[i].getstunumber());
					   System.out.println("                 学生姓名:"+s[i].getname());
					   System.out.println("             请输入修改后数据库的成绩:");
					   s[i].setdatabasescore(sc.nextDouble());
					   break;
				case 5:
					   System.out.println("****************************************************");
					   System.out.println("            石家庄铁道大学软件工程系学生学籍管理系统2019版");
					   System.out.println("                     学生考试成绩修改界面");
					   System.out.println("****************************************************");
					   System.out.println("                 学生学号:"+s[i].getstunumber());
					   System.out.println("                 学生姓名:"+s[i].getname());
					   System.out.println("             请输入修改后软件工程的成绩:");
					   s[i].setsoftwarescore(sc.nextDouble());
					   break;
				}
				System.out.println("****************************************************");
				System.out.println("            石家庄铁道大学软件工程系学生学籍管理系统2019版");
				System.out.println("                     学生考试成绩修改界面");
				System.out.println("****************************************************");
				System.out.println("                 学生学号:"+s[i].getstunumber());
				System.out.println("                 学生姓名:"+s[i].getname());
				System.out.println("                 1.高等数学成绩:"+s[i].getmathematicsscore());
				System.out.println("                 2.大学英语成绩:"+s[i].getenglishiscore());
				System.out.println("                 3.计算机网络成绩:"+s[i].getnetworkscore());
				System.out.println("                 4.数据库成绩:"+s[i].getdatabasescore());
				System.out.println("                 5.软件工程成绩:"+s[i].getsoftwarescore());
				System.out.println("                  该同学成绩已经修改完毕,是否提交(Y/N)");
				System.out.println("****************************************************");
			    String n=sc.next();
			    if(n.equals("Y")){m=1;break;}
			    else
			    {
			    	s[i].setmathematicsscore(x1);
			    	s[i].setenglishiscore(x2);
			    	s[i].setnetworkscore(x3);
			    	s[i].setdatabasescore(x4);
			    	s[i].setsoftwarescore(x5);
			    	break;
			    }
			}
			else if(i==n-1)
			{
				System.out.println("该学号不存在");
			}
		}
		if(m==1)break;
		}
	}	
	 public static void jisuan()
	 {
	  System.out.println("****************************************************");
	        System.out.println("            石家庄铁道大学软件工程系学生学籍管理系统2019版");
	        System.out.println("                     计算学生成绩绩点计算界面  ");
	        System.out.println("****************************************************");
	        System.out.println("                     请输入学生学号:XXXXXXXX");
	        System.out.println("****************************************************");
	        Scanner shuru = null;
			String a=shuru.next();
	        double mathematicspoint=0;
	        double englishpoint=0;
	        double networkpoint=0;
	        double databasepoint=0;
	        double softwarepoint=0;
	        double allpoint=0;
	  for(int i=0;i<100;i++)
	  {
	   if(a.equals(s[i].getstunumber()))
	   {
	    if(s[i].getmathematicsscore()<60)
	    {
	     mathematicspoint=0;
	    }
	    else if(s[i].getmathematicsscore()>60&&s[i].getmathematicsscore()<63.9)
	    {
	     mathematicspoint=1.0;
	    }
	    else if(s[i].getmathematicsscore()>64&&s[i].getmathematicsscore()<65.9)
	    {
	     mathematicspoint=1.5; 
	    }
	    else if(s[i].getmathematicsscore()>66&&s[i].getmathematicsscore()<67.9)
	    {
	     mathematicspoint=1.7; 
	    }
	    else if(s[i].getmathematicsscore()>68&&s[i].getmathematicsscore()<71.9)
	    {
	     mathematicspoint=2.0; 
	    }
	    else if(s[i].getmathematicsscore()>72&&s[i].getmathematicsscore()<74.9)
	    {
	     mathematicspoint=2.3; 
	    }
	    else if(s[i].getmathematicsscore()>75&&s[i].getmathematicsscore()<77.9)
	    {
	     mathematicspoint=2.7;  
	    }
	    else if(s[i].getmathematicsscore()>78&&s[i].getmathematicsscore()<81.9)
	    {
	     mathematicspoint=3.0;
	    }
	    else if(s[i].getmathematicsscore()>82&&s[i].getmathematicsscore()<84.9)
	    {
	     mathematicspoint=3.3;
	    }
	    else if(s[i].getmathematicsscore()>85&&s[i].getmathematicsscore()<89.9)
	    {
	     mathematicspoint=3.7;
	    }
	    else if(s[i].getmathematicsscore()>=90)
	    {
	     mathematicspoint=4.0;
	    }
	    if(s[i].getenglishiscore()<60)
	    {
	     englishpoint=0;
	    }
	    else if(s[i].getenglishiscore()>60&&s[i].getenglishiscore()<63.9)
	    {
	     englishpoint=1.0;
	    }
	    else if(s[i].getenglishiscore()>64&&s[i].getenglishiscore()<65.9)
	    {
	     englishpoint=1.5; 
	    }
	    else if(s[i].getenglishiscore()>66&&s[i].getenglishiscore()<67.9)
	    {
	     englishpoint=1.7; 
	    }
	    else if(s[i].getenglishiscore()>68&&s[i].getenglishiscore()<71.9)
	    {
	     englishpoint=2.0; 
	    }
	    else if(s[i].getenglishiscore()>72&&s[i].getenglishiscore()<74.9)
	    {
	     englishpoint=2.3; 
	    }
	    else if(s[i].getenglishiscore()>75&&s[i].getenglishiscore()<77.9)
	    {
	     englishpoint=2.7;  
	    }
	    else if(s[i].getenglishiscore()>78&&s[i].getenglishiscore()<81.9)
	    {
	     englishpoint=3.0;
	    }
	    else if(s[i].getenglishiscore()>82&&s[i].getenglishiscore()<84.9)
	    {
	     englishpoint=3.3;
	    }
	    else if(s[i].getenglishiscore()>85&&s[i].getenglishiscore()<89.9)
	    {
	     englishpoint=3.7;
	    }
	    else if(s[i].getenglishiscore()>=90)
	    {
	     englishpoint=4.0;
	    }
	    if(s[i].getnetworkscore()<60)
	    {
	     networkpoint=0;
	    }
	    else if(s[i].getnetworkscore()>60&&s[i].getnetworkscore()<63.9)
	    {
	     networkpoint=1.0;
	    }
	    else if(s[i].getnetworkscore()>64&&s[i].getnetworkscore()<65.9)
	    {
	     networkpoint=1.5; 
	    }
	    else if(s[i].getnetworkscore()>66&&s[i].getnetworkscore()<67.9)
	    {
	     networkpoint=1.7; 
	    }
	    else if(s[i].getnetworkscore()>68&&s[i].getnetworkscore()<71.9)
	    {
	     networkpoint=2.0; 
	    }
	    else if(s[i].getnetworkscore()>72&&s[i].getnetworkscore()<74.9)
	    {
	     networkpoint=2.3; 
	    }
	    else if(s[i].getnetworkscore()>75&&s[i].getnetworkscore()<77.9)
	    {
	     networkpoint=2.7;  
	    }
	    else if(s[i].getnetworkscore()>78&&s[i].getnetworkscore()<81.9)
	    {
	     networkpoint=3.0;
	    }
	    else if(s[i].getnetworkscore()>82&&s[i].getnetworkscore()<84.9)
	    {
	     networkpoint=3.3;
	    }
	    else if(s[i].getnetworkscore()>85&&s[i].getnetworkscore()<89.9)
	    {
	     networkpoint=3.7;
	    }
	    else if(s[i].getnetworkscore()>=90)
	    {
	     networkpoint=4.0;
	    }
	    if(s[i].getdatabasescore()<60)
	    {
	     databasepoint=0;
	    }
	    else if(s[i].getdatabasescore()>60&&s[i].getdatabasescore()<63.9)
	    {
	     databasepoint=1.0;
	    }
	    else if(s[i].getdatabasescore()>64&&s[i].getdatabasescore()<65.9)
	    {
	     databasepoint=1.5; 
	    }
	    else if(s[i].getdatabasescore()>66&&s[i].getdatabasescore()<67.9)
	    {
	     databasepoint=1.7; 
	    }
	    else if(s[i].getdatabasescore()>68&&s[i].getdatabasescore()<71.9)
	    {
	     databasepoint=2.0; 
	    }
	    else if(s[i].getdatabasescore()>72&&s[i].getdatabasescore()<74.9)
	    {
	     databasepoint=2.3; 
	    }
	    else if(s[i].getdatabasescore()>75&&s[i].getdatabasescore()<77.9)
	    {
	     databasepoint=2.7;  
	    }
	    else if(s[i].getdatabasescore()>78&&s[i].getdatabasescore()<81.9)
	    {
	     databasepoint=3.0;
	    }
	    else if(s[i].getdatabasescore()>82&&s[i].getdatabasescore()<84.9)
	    {
	     databasepoint=3.3;
	    }
	    else if(s[i].getdatabasescore()>85&&s[i].getdatabasescore()<89.9)
	    {
	     databasepoint=3.7;
	    }
	    else if(s[i].getdatabasescore()>=90)
	    {
	     databasepoint=4.0;
	    }
	    if(s[i].getsoftwarescore()<60)
	    {
	     softwarepoint=0;
	    }
	    else if(s[i].getsoftwarescore()>60&&s[i].getsoftwarescore()<63.9)
	    {
	     softwarepoint=1.0;
	    }
	    else if(s[i].getsoftwarescore()>64&&s[i].getsoftwarescore()<65.9)
	    {
	     softwarepoint=1.5; 
	    }
	    else if(s[i].getsoftwarescore()>66&&s[i].getsoftwarescore()<67.9)
	    {
	     softwarepoint=1.7; 
	    }
	    else if(s[i].getsoftwarescore()>68&&s[i].getsoftwarescore()<71.9)
	    {
	     softwarepoint=2.0; 
	    }
	    else if(s[i].getsoftwarescore()>72&&s[i].getsoftwarescore()<74.9)
	    {
	     softwarepoint=2.3; 
	    }
	    else if(s[i].getsoftwarescore()>75&&s[i].getsoftwarescore()<77.9)
	    {
	     softwarepoint=2.7;  
	    }
	    else if(s[i].getsoftwarescore()>78&&s[i].getsoftwarescore()<81.9)
	    {
	     softwarepoint=3.0;
	    }
	    else if(s[i].getsoftwarescore()>82&&s[i].getsoftwarescore()<84.9)
	    {
	     softwarepoint=3.3;
	    }
	    else if(s[i].getsoftwarescore()>85&&s[i].getsoftwarescore()<89.9)
	    {
	     softwarepoint=3.7;
	    }
	    else if(s[i].getsoftwarescore()>=90)
	    {
	     softwarepoint=4.0;
	    }
	    allpoint=(mathematicspoint*4+englishpoint*3+networkpoint*4+databasepoint*3+databasepoint*2)/16;

	   } 
	    System.out.println("****************************************************");
	    System.out.println("            石家庄铁道大学软件工程系学生学籍管理系统2019版");
	    System.out.println("                     学生考试成绩录入界面");
	    System.out.println("****************************************************");
	    System.out.println("                 学生学号:"+s[i].getstunumber());
	    System.out.println("                 学生姓名:"+s[i].getname());
	    System.out.println("                 1.高等数学成绩绩点:"+mathematicspoint);
	    System.out.println("                 2.大学英语成绩绩点:"+englishpoint);
	    System.out.println("                 3.计算机网络成绩绩点:"+networkpoint);
	    System.out.println("                 4.数据库成绩绩点:"+databasepoint);
	    System.out.println("                 5.软件工程成绩绩点:"+softwarepoint);
	    System.out.println("                 你的平均学分绩点为:"+allpoint);
	    if(allpoint>2)
	    {
	        System.out.println("                 提示信息:你的学分绩点已达到毕业要求 ");
	    }
	    if(allpoint<2)
	    {
	     System.out.println("                 提示信息:你的学分绩点不满足毕业要求");
	    }
	    System.out.println("                 是否返回系统主界面:(Y/N)");
	    System.out.println("****************************************************");
	   }
	  String c=sc.next();
		if(c.equals("Y")){meun();}
		else jisuan() ;
}	      	
   public static void main(String[] args) {
		// TODO Auto-generated method stub
	    kaishi();
		while(true)
		{
			meun();
		} 

}}