我是 Java 新手,我发现这里很难实现 GUI,这与 Visual Basic 不同。
import javax.swing.*;
import java.awt.*;
public class CalculatorGui extends JFrame{
private static final int WIDTH = 250;
private static final int HEIGHT = 250;
private JTextField enterTextField;
private JButton sevenB, eightB, nineB, divideB, fourB, fiveB, sixB, multiplyB, oneB, twoB, threeB, subtractB, zeroB, dotB, equalsB, addB;
public CalculatorGui() {
setTitle("Calculator");
setSize(WIDTH, HEIGHT);
setLayout(new GridLayout(4, 4));
enterTextField = new JTextField(30);
sevenB = new JButton("7");
eightB = new JButton("8");
nineB = new JButton("9");
divideB = new JButton("/");
fourB = new JButton("4");
fiveB = new JButton("5");
sixB = new JButton("6");
multiplyB = new JButton("*");
oneB = new JButton("1");
twoB = new JButton("2");
threeB = new JButton("3");
subtractB = new JButton("-");
zeroB = new JButton("0");
dotB = new JButton(".");
equalsB = new JButton("=");
addB = new JButton("+");
/*JPanel dataPanel = new JPanel();
JPanel buttonPanel = new JPanel();
FlowLayout flowCenter = new FlowLayout(FlowLayout.RIGHT);
GridLayout aGrid = new GridLayout(4, 4);
buttonPanel.setLayout(flowCenter);
dataPanel.setLayout(aGrid);
dataPanel.add(enterTextField);
buttonPanel.add(sevenB);
buttonPanel.add(eightB);
buttonPanel.add(nineB);
buttonPanel.add(divideB);
buttonPanel.add(fourB);
buttonPanel.add(fiveB);
buttonPanel.add(sixB);
buttonPanel.add(multiplyB);
buttonPanel.add(oneB);
buttonPanel.add(twoB);
buttonPanel.add(threeB);
buttonPanel.add(subtractB);
buttonPanel.add(zeroB);
buttonPanel.add(dotB);
buttonPanel.add(equalsB);
buttonPanel.add(addB);
add(dataPanel, BorderLayout.NORTH);
add(buttonPanel, BorderLayout.CENTER);*/
//add(enterTextField);
add(sevenB);
add(eightB);
add(nineB);
add(divideB);
add(fourB);
add(fiveB);
add(sixB);
add(multiplyB);
add(oneB);
add(twoB);
add(threeB);
add(subtractB);
add(zeroB);
add(dotB);
add(equalsB);
add(addB);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
public static void main(String[] args) {
CalculatorGui calcu = new CalculatorGui();
}
}
它可以运行,但我需要在这些按钮之前放置一个文本字段(数字)。文本字段应该流动,并且在窗口最大化时不会放大(与 4x4 按钮不同)。我尝试过 JPanel (请参阅评论),但它输出的设计很糟糕。
最佳答案
好了,构建 GUI 时需要遵循一些规则 ( rules ):
不要根据应用程序需求对 AWT/Swing/X 组件进行子类化
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 CalculatorGui {
private static final int WIDTH = 250;
private static final int HEIGHT = 250;
private JTextField enterTextField;
private JButton sevenB, eightB, nineB, divideB, fourB, fiveB, sixB, multiplyB, oneB, twoB, threeB, subtractB, zeroB, dotB, equalsB, addB;
public CalculatorGui() {
JFrame frame = new JFrame("Calculator");
frame.setTitle("Calculator");
frame.setSize(WIDTH, HEIGHT);
JPanel buttonPanel = new JPanel(new GridLayout(4, 4));
enterTextField = new JTextField();
frame.add(enterTextField, BorderLayout.NORTH);
sevenB = new JButton("7");
eightB = new JButton("8");
nineB = new JButton("9");
divideB = new JButton("/");
fourB = new JButton("4");
fiveB = new JButton("5");
sixB = new JButton("6");
multiplyB = new JButton("*");
oneB = new JButton("1");
twoB = new JButton("2");
threeB = new JButton("3");
subtractB = new JButton("-");
zeroB = new JButton("0");
dotB = new JButton(".");
equalsB = new JButton("=");
addB = new JButton("+");
buttonPanel.add(sevenB);
buttonPanel.add(eightB);
buttonPanel.add(nineB);
buttonPanel.add(divideB);
buttonPanel.add(fourB);
buttonPanel.add(fiveB);
buttonPanel.add(sixB);
buttonPanel.add(multiplyB);
buttonPanel.add(oneB);
buttonPanel.add(twoB);
buttonPanel.add(threeB);
buttonPanel.add(subtractB);
buttonPanel.add(zeroB);
buttonPanel.add(dotB);
buttonPanel.add(equalsB);
buttonPanel.add(addB);
frame.add(buttonPanel, BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
public static void main(String[] args) {
CalculatorGui calcu = new CalculatorGui();
}
}
我建议您使用WindowsBuilder Pro在对一些布局
和组件
进行良好的手动练习之后
关于java - 用 Java 设计计算器,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12016391/