java基础编程：简单计算器

最新推荐文章于 2025-05-18 14:56:39 发布

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最新推荐文章于 2025-05-18 14:56:39 发布

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分类专栏： java基础编程文章标签： java 简单计算器

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此博客展示了用Java实现简单计算器的代码。代码中导入了相关的AWT和Swing包，定义了一个继承自JFrame并实现ActionListener接口的Calculate类。

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package lkl;

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class Calculate extends JFrame implements ActionListener {
/**
*
*/
private static final long serialVersionUID = 1L;

JButton jia;
JButton jian;
JButton ji;
JButton chu;
JTextField one;
JTextField two;
JTextField three;
JLabel label;

public static void main(String[] args) {
	Calculate face = new Calculate();
	//face.init();
}

public Calculate() {
	init();
	setVisible(true);
	setResizable(true);
	validate();
	setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}

public void init() {
	setLayout(new FlowLayout());
	setSize(600, 400);
	setLocation(600, 300);
	setTitle("计算");
	jia = new JButton("加");
	jian = new JButton("减");
	ji = new JButton("积");
	chu = new JButton("除");
	one = new JTextField(10);
	two = new JTextField(10);
	three = new JTextField(50);
	label = new JLabel(" ", JLabel.CENTER);
	add(one);
	add(label);
	add(two);
	add(three);
	add(jia);
	add(jian);
	add(ji);
	add(chu);
	jia.addActionListener(this);
	jian.addActionListener(this);
	ji.addActionListener(this);
	chu.addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
	double n;
	double n1, n2;
	try {
		n1 = Double.parseDouble(one.getText());
		n2 = Double.parseDouble(two.getText());
		if (e.getSource() == jia) {
			n = n1 + n2;
			three.setText(String.valueOf(n));
			label.setText("+");
		}
		else if (e.getSource() == jian) {
			n = n1 - n2;
			three.setText(String.valueOf(n));
			label.setText("-");
		}
		else if (e.getSource() == ji) {
			n = n1 * n2;
			three.setText(String.valueOf(n));
			label.setText("*");
		} 
		else if (e.getSource() == chu) {
			n = n1 / n2;
			three.setText(String.valueOf(n));
			label.setText("/");
		}
	} catch (NumberFormatException ee) {
		three.setText("请输入数字字符");
	}
	validate();
}

}