Question

编写java一个小程序，编译时告诉我需要.class，我应该怎么修改？求高手解答！

程序如下，图片部分为出错部分，编写的不好请多包涵

import java.awt.*;
import javax.swing.*;
import java.awt.event.e;

public class Triangle extends JFrame implements ActionListener{
JTextField bottom,highly;
JButton calculate;
JTextArea text;
public Triangle(){
r=new Triangle();
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
JPanel p1=new JPanel();
p1.add(new JLabel("底边:"));
bottom=new JTextField(5);
p1.add(bottom);
p1.add(new JTextField("高度"));
highly=new JTextField(5);
p1.add(highly);
calculate=new JButton("计算面积");
calculate.addActionListener(this);
p1.add(calculate);
this.getContentPane().add(p1,"North");
text=new JTextArea(5,20);
this.getContentPane().add(text);
this.setVisible(true);
}
public static void actionPerformed(ActionEvent r){
try{
int bottom1=Class.parseInt(bottom.getText());
int highly1=Class.parseInt(highly.getText());
r.setBottom(int);
r.setHighly(int);
if(r.isTriangle())
text.append("面积:"+area()+"\n");

}
catch(Exception ex){
text.append("出错:"+ex.toString()+"\n");
}
}
}
class triangle{
private int bottom;
private int highly;
public void setBottom(int bottom){
this.bottom=bottom;
}
public void setHighly(int highly){
this.highly=highly;
}
public boolean isTriangle(){
return bottom==highly?true:false;
}
public int area(){
return (bottom*highly)/2;
}
}

Answer 1

连main方法都不写你的程序的入口都没有 你怎么可能运行得出来
而且 set()里面写int是什么语法 建议多看看java基础再来写

追问

菜鸟初学者，希望高手指出具体位置的错误！

追答

r.setBottom(bottm1)
r.setHighly(highly)

追问

谢谢高手的解答！