Java GUI编程之(四) 一个温度转换程序

素颜马尾好姑娘i 2022-09-19 00:25 600阅读 0赞

运行界面：

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代码：

package com.sxpi;
    
    import java.awt.Button;
    
    public class WenDuChang extends JFrame implements ActionListener{
    	private JTextField textField;
    	private JTextField textField_1;
        private JLabel label;
        private JLabel label_1;
        private JLabel label_2;
        private JRadioButton[] radioButton;   
        private JButton button;
        private JButton button_1;
        private ButtonGroup bg;
        
    	
    	
    	public WenDuChang() {
    		//获取你的屏幕的宽和高
    		int width = Toolkit.getDefaultToolkit().getScreenSize().width;
    	    int height = Toolkit.getDefaultToolkit().getScreenSize().height;
    	    setLocation(width/2-200, height/2-150);
    	    setTitle("\u6E29\u5EA6\u8F6C\u6362\u5668");
    		getContentPane().setLayout(null);
    		
    		textField = new JTextField();//摄氏温度
    		textField.setText("0.0");
    		textField.setBounds(50, 63, 84, 27);
    		getContentPane().add(textField);
    		textField.setColumns(10);
    		
    		label = new JLabel("\u6444\u6C0F\u6E29\u5EA6");
    		label.setBounds(137, 69, 54, 15);
    		getContentPane().add(label);
    		
    		label_1 = new JLabel("=");
    		label_1.setBounds(201, 69, 54, 15);
    		getContentPane().add(label_1);
    		
    		textField_1 = new JTextField();//华氏温度
    		textField_1.setText("0.0");
    		textField_1.setBounds(223, 66, 90, 24);
    		getContentPane().add(textField_1);
    		textField_1.setColumns(10);
    		
    		label_2 = new JLabel("\u534E\u6C0F\u6E29\u5EA6");
    		label_2.setBounds(323, 69, 54, 15);
    		getContentPane().add(label_2);
    		
    		radioButton = new JRadioButton[2];
    		radioButton[0] = new JRadioButton("\u6444\u6C0F\u8F6C\u534E\u6C0F",true);
    		radioButton[0].setBounds(100, 142, 121, 23);
    		getContentPane().add(radioButton[0]);
    		
    		radioButton[1] = new JRadioButton("\u534E\u6C0F\u8F6C\u6444\u6C0F");
    		radioButton[1].setBounds(223, 142, 121, 23);
    		getContentPane().add(radioButton[1]);
    		
    		
    		bg=new ButtonGroup(); 
    		bg.add(radioButton[0]);
    		bg.add(radioButton[1]);
    
    		
    		button = new JButton("\u6E29\u5EA6\u8F6C\u5316");
    		button.setBounds(100, 196, 93, 23);
    		button.addActionListener(this);
    		getContentPane().add(button);
    		
    		button_1 = new JButton("\u9000\u51FA");
    		button_1.setBounds(237, 196, 93, 23);
    		button_1.addActionListener(this);
    		getContentPane().add(button_1);
    		
    		setSize(450, 300);
    		setVisible(true);
    	}
    
    	
    	//用于温度转换的方法-----业务处理
    	public String WenDuChang(final double tc,final double tf,boolean flag){
    		double wdc=0.0;
    		//小数格式化，引号中的0.000表示保留小数点后二位（第四位四舍五入）
    		DecimalFormat df = new DecimalFormat("0.00");
    		String str;
    		if(flag){			
    			wdc=9*(tc-10)/5+50;	//摄氏温度转化为华氏温度		
    		}
    		else{
    			wdc=5*(tf-50)/9+10;	//华氏温度转化为摄氏温度		
    		}
    		str=df.format(wdc);
    		return str;		
    	}
    	
    	
    	
    	@Override
    	public void actionPerformed(ActionEvent e) {
    		double tc = Double.parseDouble(textField.getText().trim());
    		double tf = Double.parseDouble(textField_1.getText().trim());
    		
    		if(e.getSource()==button){
    			//System.out.println("按钮被选中.....");
    			if(radioButton[0].isSelected()){//判断radioButton是否被选中
    				textField_1.setText(WenDuChang(tc,tf,true));
    			}
    			if(radioButton[1].isSelected()){
    				textField.setText(WenDuChang(tc,tf,false));			
    				
    			}
    			
    		}
    		if(e.getSource()==button_1){
    			System.exit(0);
    		}
    		
    	}
    	
    	
    	
    	
    	
    }

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