GUI编程之简易计算器(非常简单)：三种思想

谁借莪１个温暖的怀抱￠ 2022-11-10 10:46 145阅读 0赞

## 简易计算器 ##

**有三种实现：**

> 1.  面向过程
> 2.  面向对象
> 3.  内部类

**面向过程**  
**示例代码：**

//简易计算器       面向过程
    public class TestCalc01 {
        
        public static void main(String[] args) {
        
            //运行
            new Calculator01();
        }
    }
    //计算器类
    class Calculator01 extends Frame {
        
        public Calculator01(){
        
            //三个文本框
            TextField textField1 = new TextField(10);
            TextField textField2 = new TextField(10);
            TextField textField3 = new TextField(20);
            //一个按钮
            Button button = new Button("=");
            button.addActionListener(new MyCalculatorListener01(textField1, textField2, textField3));
            //一个标签
            Label label = new Label("+");
            //布局
            setLayout(new FlowLayout());
            add(textField1);
            add(label);
            add(textField2);
            add(button);
            add(textField3);
            pack();
            setVisible(true);
            addWindowListener(new WindowAdapter() {
        
                @Override
                public void windowClosing(WindowEvent e) {
        
                    System.exit(0);
                }
            });
        }
    }
    //监听类
    class MyCalculatorListener01 implements ActionListener {
        
        private TextField textField1;
        private TextField textField2;
        private TextField textField3;
        public MyCalculatorListener01(TextField textField1,TextField textField2,TextField textField3) {
        
            this.textField1 = textField1;
            this.textField2 = textField2;
            this.textField3 = textField3;
        }
        @Override
        public void actionPerformed(ActionEvent e) {
        
            //1.获得加数和被加数
            int n1 = Integer.parseInt(textField1.getText());
            int n2 = Integer.parseInt(textField2.getText());
            //2.将
            textField3.setText(""+(n1+n2));
            //3.清除前两个框
            textField1.setText("");
            textField2.setText("");
        }
    
    }

**面向对象**  
**示例代码：**

//简易计算器      面向对象
    public class TestCalc02 {
        
        public static void main(String[] args) {
        
            new Calculator02().loadFrame();
        }
    }
    //计算机类
    class Calculator02 extends Frame {
        
        //属性
        TextField num1,num2,num3;
        //方法
        public void loadFrame(){
        
            //3个文本框
            num1 = new TextField(10);
            num2 = new TextField(10);
            num3 = new TextField(20);
            //1个按钮
            Button button = new Button("=");
            button.addActionListener(new MyCalculatorListener02(this));
            //1个标签
            Label label = new Label("+");
            //布局
            setLayout(new FlowLayout());
            add(num1);
            add(label);
            add(num2);
            add(button);
            add(num3);
            pack();
            setVisible(true);
        }
    }
    //监听器类
    class MyCalculatorListener02 implements ActionListener {
        
        //获取计算机这个对象，在一个类中组合另一个类
        Calculator02 calculator = null;
        public MyCalculatorListener02(Calculator02 calculator){
        
            this.calculator=calculator;
        }
        @Override
        public void actionPerformed(ActionEvent e) {
        
            //1、获得加数和被加数
            //2、将这个值+法运算后，放到第三个框
            //3、清楚前两个框
            int n1 = Integer.parseInt(calculator.num1.getText());
            int n2 = Integer.parseInt(calculator.num2.getText());
            calculator.num3.setText(""+(n1+n2));
            calculator.num1.setText("");
            calculator.num2.setText("");
        }
    
    }

**内部类**  
**示例代码：**

//内部类
    public class TestCalc03 {
        
        public static void main(String[] args) {
        
            new Calculator03();
        }
    }
    //计算器类
    class Calculator03 extends Frame {
        
        TextField num1,num2,num3;
        public void LoadFrame(){
        
            num1 = new TextField(10);
            num2 = new TextField(10);
            num3 = new TextField(20);
            Button button = new Button("=");
            Label label = new Label("+");
            button.addActionListener(new MyCalculatorListener03());
            setLayout(new FlowLayout());
            add(num1);
            add(label);
            add(num2);
            add(button);
            add(num3);
            pack();
            setVisible(true);
        }
        //监听器类---》内部类
        //内部类好处，畅通无阻的访问外部类
        private class MyCalculatorListener03 implements ActionListener {
        
            @Override
            public void actionPerformed(ActionEvent e) {
        
                //1.获得加数和被加数
                //2.将这个值加法运算后，放到第三个框
                //3.清除前两个框
                int n1 = Integer.parseInt(num1.getText());
                int n2 = Integer.parseInt(num2.getText());
                num3.setText(""+(n1+n2));
                num1.setText("");
                num2.setText("");
            }
        }
    }