stu

System.out.println("1: 查询学生记录.");
System.out.println("2: 修改学生记录(学号无法改).");
System.out.println("3: 显示总成绩和平均成绩.");
System.out.println("4: 计算某位学生的名次.");
else
return false;
}
public boolean compare_m(student sm)//比较math成绩,左边大于右边则返回TRUE,否则返回FALSE
{
if(this.mgrade>sm.mgrade)
return true;
else
return false;
}
public boolean compare_t(student st)//比较total,左边大于右边则返回TRUE,否则返回FALSE
{
if(this.total>st.total)
return true;
else
return false;
System.out.println();
}
public void show(int i) //用于按某门课排序输出
{
System.out.print("num="+num);
System.out.print(" name="+name);
System.out.print(" jgrade="+jgrade);
return false;
}
public boolean compare_e(student se)//比较english成绩,左边大于右边则返回TRUE,否则返回FALSE
{
if(this.egrade>se.egrade)
return true;
else
int flag;
System.out.println("需要修改什么?");
ave=total/3; } public void setegrade(int egrade)
{
this.egrade=egrade;
total=jgrade+mgrade+egrade;
ave=total/3;
}
public void setmingci(int mingci,int ch)
System.out.println("5: 40名学生按某门成绩或总成绩排序打印出来.");
System.out.println("6 此学生操作结束");
System.out.println("其余数字错误!");
System.out.println("警告,程序中需要输入数字时,输入其它字符等非数字会造成程序崩溃!!!");
System.out.println("english 没成绩! ");
}
}
public class stu
{
static void check(String str1) throws NumberFormatException
{
char ch;
for(int i=0;i<str1.length();i++)
{
this.jgrade=jgrade;
total=jgrade+mgrade+egrade;
ave=total/3;
}
public void setmgrade(int mgrade)
{
this.mgrade=mgrade;
total=jgrade+mgrade+egrade;
System.out.println("englishgrade= "+egrade);
System.out.println("total= "+total);
System.out.println("averagegrade= "+ave);
System.out.println("mingci= "+mingci[3]);//默认打印按总成绩排的名字
BufferedReader buf=new BufferedReader(new InputStreamReader(System.in));
do
{
System.out.println("要改变操作对象吗,y代表要换个学生,其余代表还是对学号为"+num+"的学生对象操作");
{
this.mingci[ch]=mingci;
}
public boolean compare_j(student sj)//比较java成绩,左边大于右边则返回TRUE,否则返回FALSE
{
if(this.jgrade>sj.jgrade)
return true;
System.out.println("averagegrade= "+ave);
if(jgrade==0)
System.out.println("java 没成绩! ");
if(mgrade==0)
System.out.println("math没成绩! ");
if(egrade==0)
num=Integer.parseInt(buf.readLine());
}while(num<80604101||num>80604140);
System.out.println("对该学生所需操作请做出选项,请输入0--6的正整数");
System.out.print(" mgrade="+mgrade);
System.out.print(" egrade="+egrade);
System.out.print(" total="+total);
System.out.print(" ave="+ave);
System.out.print(" mingci= "+mingci[i]);
public void setnum(int num)
{
this.num=num;
}
public void setname(String name)
{
=name;
}
public void setjgrade(int jgrade)
{
s[i]=new student();
s[i].setnum(80604101+i);
}
System.out.println("Hello "+s.length+" students!");
String str;
int select;
sm.show();
str=buf.readLine();
select=Integer.parseInt(str);
switch(select)
{
case 0:
System.exit(0);
System.out.println();
}
}
class student /*标记为student类*/
{
private int num; /*学号*/
private String name; /*姓名*/
private int jgrade; /*java语言成绩*/
{
showmenu sm;
sm=new showmenu();
String str1;
int ch,i,j; //ch表示按哪门课排名,i,j控制
int num=80604101; /*学号*/
{
ch=str1.charAt(i);
if(!Character.isDigit(ch)) //判断参数中是否为数字
throw new NumberFormatException(); //方法中抛出异常
}
}
public static void main(String[] args) throws IOException
int[] mingci=new int[4]; /*名次*/
int[] mc=new int[40]; //与对象数组所对应的名次,用于排序打印出来
student s[] = new student[40];
for (i = 0; i < s.length; i++)
String name; /*姓名*/
int jgrade; /*java语言成绩*/
int mgrade; /*数学成绩*/
int egrade; /*英语成绩*/
int total; /*总分*/
float ave; /*平均分*/
import java.io.*;
class showmenu
{
public void show()