用Java编程:计算器,使用恰当的组件和容器,加完成软件界面设计。

好的，以下是一个简单的Java计算器程序的界面设计和代码实现：

界面设计：

import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class CalculatorUI {
    private JFrame frame;
    private JTextField textField;
    private JPanel buttonPanel;

    public CalculatorUI() {
        frame = new JFrame("Calculator");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        textField = new JTextField();
        textField.setHorizontalAlignment(JTextField.RIGHT);
        frame.add(textField, BorderLayout.NORTH);

        buttonPanel = new JPanel(new GridLayout(4, 4));
        frame.add(buttonPanel, BorderLayout.CENTER);

        addButton("7");
        addButton("8");
        addButton("9");
        addButton("/");
        addButton("4");
        addButton("5");
        addButton("6");
        addButton("*");
        addButton("1");
        addButton("2");
        addButton("3");
        addButton("-");
        addButton("0");
        addButton(".");
        addButton("=");
        addButton("+");

        frame.pack();
        frame.setVisible(true);
    }

    private void addButton(String label) {
        JButton button = new JButton(label);
        button.addActionListener(new CalculatorActionListener(textField, label));
        buttonPanel.add(button);
    }

    public static void main(String[] args) {
        new CalculatorUI();
    }
}

代码实现：

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JTextField;

public class CalculatorActionListener implements ActionListener {
    private JTextField textField;
    private String label;
    private double result = 0;
    private String operator = "";
    private boolean start = true;

    public CalculatorActionListener(JTextField textField, String label) {
        this.textField = textField;
        this.label = label;
    }

    public void actionPerformed(ActionEvent e) {
        String input = label;

        if (input.equals("C")) {
            result = 0;
            operator = "";
            start = true;
            textField.setText("");
        } else if (input.equals("=")) {
            if (operator.equals("+")) {
                result += Double.parseDouble(textField.getText());
            } else if (operator.equals("-")) {
                result -= Double.parseDouble(textField.getText());
            } else if (operator.equals("*")) {
                result *= Double.parseDouble(textField.getText());
            } else if (operator.equals("/")) {
                result /= Double.parseDouble(textField.getText());
            }
            textField.setText("" + result);
            operator = "";
            start = true;
        } else if (input.equals("+") || input.equals("-") || input.equals("*") || input.equals("/")) {
            if (start) {
                if (input.equals("-")) {
                    textField.setText(input);
                    start = false;
                } else {
                    operator = input;
                }
            } else {
                double x = Double.parseDouble(textField.getText());
                if (operator.equals("+")) {
                    result += x;
                } else if (operator.equals("-")) {
                    result -= x;
                } else if (operator.equals("*")) {
                    result *= x;
                } else if (operator.equals("/")) {
                    result /= x;
                }
                operator = input;
                textField.setText("" + result);
            }
            start = false;
        } else {
            if (start) {
                textField.setText("");
                start = false;
            }
            textField.setText(textField.getText() + input);
        }
    }
}

这个简单的Java计算器程序可以进行加、减、乘、除四则运算，也支持多次连续计算。