监视器

来源：互联网发布：张仪苏秦知乎编辑：程序博客网时间：2024/04/30 05:09

//y.javapublic class y {public static void main(String[] args) {WindowOperation win=new WindowOperation();win.setBounds(100,100,390,360);win.setTitle("简单计算器");}}

//WindowOperation.javaimport java.awt.*;import javax.swing.*;public class WindowOperation extends JFrame{    JTextField inputNumberOne,inputNumberTwo;    JComboBox choiceFuhao;    JTextArea textShow;    JButton button;    OperatorListener operator;    ComputerListener computer;    public WindowOperation(){    init();    setVisible(true);    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    }    void init(){    setLayout(new FlowLayout());    inputNumberOne=new JTextField(5);    inputNumberTwo=new JTextField(5);    choiceFuhao=new JComboBox();    button=new JButton("计算");    choiceFuhao.addItem("选择运算符号");    String[]a={"+","-","*","/"};    for(int i=0;i<a.length;i++){    choiceFuhao.addItem(a[i]);    }    textShow=new JTextArea(9,30);    operator=new OperatorListener();    computer=new ComputerListener();    operator.setJComboBox(choiceFuhao);    operator.setWorkTogether(computer);    computer.setJTextFieldOne(inputNumberOne);    computer.setJTextFieldTwo(inputNumberTwo);    computer.setJTextArea(textShow);    choiceFuhao.addItemListener(operator);    button.addActionListener(computer);    add(inputNumberOne);    add(choiceFuhao);    add(inputNumberTwo);    add(button);    add(new JScrollPane(textShow));    }}

//OperatorListener.java  import java.awt.event.*;import javax.swing.*;public class OperatorListener implements ItemListener {   JComboBox choice;   ComputerListener workTogether;   public void setJComboBox(JComboBox box) {      choice = box;   }   public void setWorkTogether(ComputerListener computer) {      workTogether = computer;   }   public void itemStateChanged(ItemEvent e)  {      String fuhao = choice.getSelectedItem().toString();      workTogether.setFuhao(fuhao);   }}

//ComputerListener.java import java.awt.event.*;import javax.swing.*;public class ComputerListener implements ActionListener {   JTextField inputNumberOne,inputNumberTwo;    JTextArea textShow;   String fuhao;   public void setJTextFieldOne(JTextField t) {       inputNumberOne = t;   }   public void setJTextFieldTwo(JTextField t) {       inputNumberTwo = t;   }   public void setJTextArea(JTextArea area) {       textShow = area;   }   public void setFuhao(String s) {       fuhao = s;   }   public void actionPerformed(ActionEvent e) {      try {            double number1 = Double.parseDouble(inputNumberOne.getText());            double number2 = Double.parseDouble(inputNumberTwo.getText());            double result = 0;            if(fuhao.equals("+")) {                result = number1+number2;            }            else if(fuhao.equals("-")) {                result = number1-number2;            }            else if(fuhao.equals("*")) {                result = number1*number2;            }            else if(fuhao.equals("/")) {                result = number1/number2;            }            textShow.append(number1+" "+fuhao+" "+number2+" = "+result+"\n");      }      catch(Exception exp) {             textShow.append("\n请输入数字字符\n");      }   }}

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