calculate.java

主要是对于JAVA的编程的基本语言 希望能够帮得上你。

package applet;

import java.applet.Applet;
import java.awt.Button;
import java.awt.Color;
import java.awt.Label;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Calculate extends Applet implements ActionListener{
	
	Label lblNumber1=new Label("输入第一个数字：");
	Label lblNumber2=new Label("输入第二个数字：");
	Label lblResult=new Label("计算结果：");
	TextField txtNumber1=new TextField("",10);
	TextField txtNumber2=new TextField("",10);
	TextField txtResult=new TextField("",10);
	Button btnOK=new Button("计算");	
	double number1,number2,result;
	
	public void init(){				
		//添加组件
		this.add(lblNumber1);		
		this.add(txtNumber1);		
		this.add(lblNumber2);		
		this.add(txtNumber2);		
		this.add(lblResult);
		this.add(txtResult);
		this.add(btnOK);		
		//设置属性		
		this.setBackground(Color.BLUE);	
		
		//注册监听器
		btnOK.addActionListener(this);				
	}
	
	public void actionPerformed(ActionEvent e) {
		if(e.getSource()==btnOK){
			number1=Double.parseDouble((this.txtNumber1.getText()));
			number2=Double.parseDouble((this.txtNumber2.getText()));
			result=number1+number2;
			txtResult.setText(String.valueOf(result));
		}		
	}
}