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  1. import java.awt.*;
  2. import java.awt.event.*;
  3.  
  4. public class app18_8b extends Frame implements ActionListener
  5. {
  6. 	static app18_8b frm=new app18_8b();  //用app18_8b類別產生frm物件
  7. 	static Panel pnl=new Panel(new GridLayout(4,3));   //建立面板物件pnl
  8. 	static Panel pnl2=new Panel(new GridLayout(4,1));  //建立面板物件pnl2
  9. 	static Label lab=new Label("0.",Label.RIGHT);   //建立lab 初值為"0." 向右靠齊
  10.    //產生button物件
  11.    static Button btn0=new Button("0");
  12. 	static Button btn1=new Button("1");
  13. 	static Button btn2=new Button("2");
  14. 	static Button btn3=new Button("3");
  15. 	static Button btn4=new Button("4");
  16. 	static Button btn5=new Button("5");
  17. 	static Button btn6=new Button("6");
  18. 	static Button btn7=new Button("7");
  19. 	static Button btn8=new Button("8");
  20. 	static Button btn9=new Button("9");
  21.    static Button btn10=new Button("+");
  22.    static Button btn11=new Button("-");
  23.    static Button btn12=new Button("*");
  24.    static Button btn13=new Button("/");
  25.    static Button btn14=new Button("C");
  26.    static Button btn15=new Button("=");
  27.  
  28. 	public static void main(String args[])
  29. 	{
  30. 		frm.setLayout(null); //取消排版
  31. 		frm.setSize(200,200);   //設定frm的大小
  32. 		frm.setLocation(100,100);  //設定frm的初始位置
  33. 		frm.setBackground(Color.white);  //設定frm得背景顏色
  34. 		frm.setResizable(false);   //設定frm不可以再調整大小
  35.  
  36. 		lab.setBounds(20,30,160,20);  //設定lab的位置與大小
  37. 		lab.setBackground(new Color(255,230,200));   //設定lab得背景顏色
  38.       //介面一 0~9、c、=
  39. 		pnl.setBounds(20,60,120,120); //設定pnl的位置與大小
  40. 		pnl.add(btn7); //將按鍵加入介面pnl
  41. 		pnl.add(btn8);
  42. 		pnl.add(btn9);
  43. 		pnl.add(btn4);
  44. 		pnl.add(btn5);
  45. 		pnl.add(btn6);
  46. 		pnl.add(btn1);
  47. 		pnl.add(btn2);
  48. 		pnl.add(btn3);
  49.       pnl.add(btn0);
  50.       pnl.add(btn14);
  51.       pnl.add(btn15);
  52.       //介面二 + - * /
  53. 		pnl2.setBounds(140,60,40,120);   //設定pnl2的位置與大小
  54. 		pnl2.add(btn10);  //將按鍵加入pnl2
  55. 		pnl2.add(btn11);
  56. 		pnl2.add(btn12);
  57. 		pnl2.add(btn13);
  58.       //註冊
  59.       btn0.addActionListener(frm);  //將frm向按鍵註冊
  60.       btn1.addActionListener(frm);
  61.       btn2.addActionListener(frm);
  62.       btn3.addActionListener(frm);
  63.       btn4.addActionListener(frm);
  64.       btn5.addActionListener(frm);
  65.       btn6.addActionListener(frm);
  66.       btn7.addActionListener(frm);
  67.       btn8.addActionListener(frm);
  68.       btn9.addActionListener(frm);
  69.       btn10.addActionListener(frm);
  70.       btn11.addActionListener(frm);
  71.       btn12.addActionListener(frm);
  72.       btn13.addActionListener(frm);
  73.       btn14.addActionListener(frm);
  74.       btn15.addActionListener(frm);
  75.  
  76. 		frm.add(lab);  //將lab加入frm
  77. 		frm.add(pnl);  //將pnl加入frm
  78. 		frm.add(pnl2); //將pbl2加入frm
  79.  
  80. 		frm.setVisible(true);
  81.       //關閉
  82.    	frm.addWindowListener(new WindowAdapter(){
  83.        	public void windowClosing(WindowEvent e){System.exit(0);}});
  84. 	}
  85.  
  86.    public int operandl=0;  //保留準備運算的值
  87.    public String str="";   //輸入控制 將輸入用字串串起
  88.    public String op="";    //記錄運算子
  89. 	public void actionPerformed(ActionEvent e)
  90. 	{
  91. 		Button btn=(Button) e.getSource();  //讀取輸入的button
  92.       //運算
  93.       if(btn==btn10||btn==btn11||btn==btn12||btn==btn13||btn==btn15)//按下+-*/=時
  94.       {
  95.          int number=Integer.parseInt(lab.getText());
  96.          switch(op)  //若之前有保留運算的先運算 op!=0
  97.          {
  98.              case "+":   // 加
  99.                 number = operandl+number;
  100.                 break;
  101.              case "-":   // 減
  102.                 number = operandl-number;
  103.                 break;
  104.              case "*":   // 乘
  105.                 number = operandl*number;
  106.                 break;
  107.              case "/":   // 除
  108.                 if(number!=0)    // 避免 /0
  109.                 number = operandl/number;
  110.                 break;
  111.          }
  112.          lab.setText(Integer.toString(number));
  113.          op=btn.getLabel();
  114.          if(op!="=")
  115.          {
  116.             operandl = number;
  117.             str = "";
  118.          }
  119.       }
  120.       //清除
  121.       else if(btn==btn14)//按下c時
  122.       {
  123.          str="";
  124.          operandl=0;
  125.          op="";
  126.          lab.setText("0.");
  127.       }
  128.       //數字
  129.       else//按下0~9
  130.       {
  131.          int num=Integer.parseInt(btn.getLabel());
  132.          if(num!=0 || str.length()!=0)//避免輸入的第一個字串為0
  133.          {
  134. 		      str+=btn.getLabel();
  135. 		      lab.setText(str);
  136.          }
  137.       }
  138. 	}
  139. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:4: error: class app18_8b is public, should be declared in a file named app18_8b.java
public class app18_8b extends Frame implements ActionListener
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/OEqeHC
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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