用java写一个SWT应用程序窗口的计算器代码

以下是一个简单的SWT应用程序窗口计算器的Java代码：

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class Calculator {
    private Shell shell;
    private Text displayText;

    public Calculator(Display display) {
        shell = new Shell(display);
        shell.setText("Calculator");
        shell.setLayout(new GridLayout(4, true));

        // 创建显示文本区域
        displayText = new Text(shell, SWT.RIGHT);
        GridData gridData = new GridData(SWT.FILL, SWT.CENTER, true, false, 4, 1);
        displayText.setLayoutData(gridData);

        // 创建数字和运算符按钮
        Button button0 = new Button(shell, SWT.PUSH);
        button0.setText("0");
        gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
        button0.setLayoutData(gridData);

        Button button1 = new Button(shell, SWT.PUSH);
        button1.setText("1");
        gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
        button1.setLayoutData(gridData);

        Button button2 = new Button(shell, SWT.PUSH);
        button2.setText("2");
        gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
        button2.setLayoutData(gridData);

        Button button3 = new Button(shell, SWT.PUSH);
        button3.setText("3");
        gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
        button3.setLayoutData(gridData);

        Button button4 = new Button(shell, SWT.PUSH);
        button4.setText("4");
        gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
        button4.setLayoutData(gridData);

        Button button5 = new Button(shell, SWT.PUSH);
        button5.setText("5");
        gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
        button5.setLayoutData(gridData);

        Button button6 = new Button(shell, SWT.PUSH);
        button6.setText("6");
        gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
        button6.setLayoutData(gridData);

        Button button7 = new Button(shell, SWT.PUSH);
        button7.setText("7");
        gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
        button7.setLayoutData(gridData);

        Button button8 = new Button(shell, SWT.PUSH);
        button8.setText("8");
        gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
        button8.setLayoutData(gridData);

        Button button9 = new Button(shell, SWT.PUSH);
        button9.setText("9");
        gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
        button9.setLayoutData(gridData);

        Button buttonPlus = new Button(shell, SWT.PUSH);
        buttonPlus.setText("+");
        gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
        buttonPlus.setLayoutData(gridData);

        Button buttonMinus = new Button(shell, SWT.PUSH);
        buttonMinus.setText("-");
        gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
        buttonMinus.setLayoutData(gridData);

        Button buttonMultiply = new Button(shell, SWT.PUSH);
        buttonMultiply.setText("*");
        gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
        buttonMultiply.setLayoutData(gridData);

        Button buttonDivide = new Button(shell, SWT.PUSH);
        buttonDivide.setText("/");
        gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
        buttonDivide.setLayoutData(gridData);

        Button buttonEquals = new Button(shell, SWT.PUSH);
        buttonEquals.setText("=");
        gridData = new GridData(SWT.FILL, SWT.CENTER, true, false);
        buttonEquals.setLayoutData(gridData);

        // 添加按钮事件监听器
        SelectionAdapter buttonListener = new SelectionAdapter() {
            public void widgetSelected(SelectionEvent event) {
                Button button = (Button) event.widget;
                String buttonText = button.getText();
                String displayString = displayText.getText();
                displayText.setText(displayString + buttonText);
            }
        };

        button0.addSelectionListener(buttonListener);
        button1.addSelectionListener(buttonListener);
        button2.addSelectionListener(buttonListener);
        button3.addSelectionListener(buttonListener);
        button4.addSelectionListener(buttonListener);
        button5.addSelectionListener(buttonListener);
        button6.addSelectionListener(buttonListener);
        button7.addSelectionListener(buttonListener);
        button8.addSelectionListener(buttonListener);
        button9.addSelectionListener(buttonListener);

        // 添加运算符按钮事件监听器
        SelectionAdapter operatorListener = new SelectionAdapter() {
            public void widgetSelected(SelectionEvent event) {
                Button button = (Button) event.widget;
                String buttonText = button.getText();
                String displayString = displayText.getText();
                displayText.setText(displayString + " " + buttonText + " ");
            }
        };

        buttonPlus.addSelectionListener(operatorListener);
        buttonMinus.addSelectionListener(operatorListener);
        buttonMultiply.addSelectionListener(operatorListener);
        buttonDivide.addSelectionListener(operatorListener);

        // 添加等于号按钮事件监听器
        buttonEquals.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent event) {
                String displayString = displayText.getText();
                String[] tokens = displayString.split(" ");
                int result = Integer.parseInt(tokens[0]);
                for (int i = 1; i < tokens.length; i += 2) {
                    String operator = tokens[i];
                    int operand = Integer.parseInt(tokens[i + 1]);
                    if (operator.equals("+")) {
                        result += operand;
                    } else if (operator.equals("-")) {
                        result -= operand;
                    } else if (operator.equals("*")) {
                        result *= operand;
                    } else if (operator.equals("/")) {
                        result /= operand;
                    }
                }
                displayText.setText(Integer.toString(result));
            }
        });

        // 设置窗口大小和打开窗口
        shell.setSize(200, 200);
        shell.open();
    }

    public void run() {
        Display display = Display.getDefault();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
        display.dispose();
    }

    public static void main(String[] args) {
        Display display = new Display();
        Calculator calculator = new Calculator(display);
        calculator.run();
    }
}

这个窗口计算器包含数字、运算符、等于号按钮和一个文本区域来显示计算结果。每当用户点击一个数字或运算符按钮时，它们都将显示在文本区域中。当用户点击等于号按钮时，程序将从文本区域中提取出数字和运算符，计算结果并将其显示在文本区域中。