如何调用total的值，并输出

Question

import javax.swing.JOptionPane;public class Student { String xh,name; int yy,math,yw,total; Student(String xh1,String name1){ xh=xh1; name=name1; } Student(String xh1,String name1,int yy1,int math1,int yw1){ xh=xh1; name=name1; yy=yy1; math=math1; yw=yw1; } public void display(){ String str=JOptionPane.showInputDialog("请输入英语成绩:"); yy=Integer.parseInt(str); str=JOptionPane.showInputDialog("请输入数学成绩:"); math=Integer.parseInt(str); str=JOptionPane.showInputDialog("请输入语文成绩:"); yw=Integer.parseInt(str); JOptionPane.showMessageDialog(null,"学号:"+xh+"\n姓名:"+name+"\n数学:"+math+"\n英语:"+yy+"\n语文:"+yw+"\n总成绩"+total); } public void sum(){ total=yy+yw+math; } public static void main(String[] args) { Student t1=new Student("xxx", "xxx"); t1.display(); } }

Answer 1

看图

你只是声明了全局变量, 但没有调用