Question

我是Java的新手，我们得到了一项任务。我必须创建一个执行某些操作的数学框架，并以某种方式格式化GUI。除了将三个文本字段堆叠在顶部之外，我可以做任何事情。像这样：

t1
t2
t3

这三个垂直向左倾斜，而其他四个方框横跨底部。

其中t1，t2和t3是文本字段，1,2,3和4是操作的功能。

我不能让x，y和z在左边。这是我的代码，请尽可能帮忙！

ConvertFrame.java：

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;

public class ConvertFrame extends JFrame {
    private final JLabel prompt; // label to prompt user to enter Fahrenheit
    private final JLabel display; // label to display temperature in Celsius
    private final JTextField temperatureF; // textfield to enter temperature
    private JButton b1;
    private JButton b2;
    private JButton b3;
    private JButton b4;
    private JTextField t1;
    private JTextField t2;
    private JTextField t3;

    private JLabel operation;
    private JLabel equL;

    // constructor sets up GUI
    public ConvertFrame() {
        super("Math Frame");

        prompt = new JLabel("Enter two numbers:");

        operation = new JLabel("        OPR ");
        equL = new JLabel(" = ");

        temperatureF = new JTextField(10); // textfield
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(1, 3));

        JPanel panel2 = new JPanel();
        panel2.setLayout(new GridLayout(1, 5));

        b1 = new JButton("ADD");
        b2 = new JButton("SUB");
        b3 = new JButton("MUL");
        b4 = new JButton("CLEAR");

        t1 = new JTextField(7);
        t2 = new JTextField(7);
        t3 = new JTextField(7);

        panel2.add(t1);
        panel2.add(operation);
        panel2.add(t2);
        panel2.add(equL);
        panel2.add(t3);

        panel.add(b1);
        panel.add(b2);
        panel.add(b3);
        panel.add(b4);
        // register anonymous action listener

        Handler1 h1 = new Handler1();
        Handler2 h2 = new Handler2();
        Handler3 h3 = new Handler3();
        Handler4 h4 = new Handler4();

        b1.addActionListener(h1);
        b2.addActionListener(h2);
        b3.addActionListener(h3);
        b4.addActionListener(h4);

        display = new JLabel("");

        add(prompt, BorderLayout.NORTH); // north region
        add(panel2, BorderLayout.CENTER); // center region
        add(panel, BorderLayout.SOUTH); // south region
    } // end ConvertFrame constructor

    private class Handler1 implements ActionListener // anonymous inner class
    {
        public void actionPerformed(ActionEvent e) {
            String st1 = t1.getText();
            String st2 = t2.getText();
            int x = Integer.parseInt(st1);
            int y = Integer.parseInt(st2);
            int z = x + y;
            String st3 = "";
            st3 = st3 + z;
            t3.setText(st3);

        }
    } //

    private class Handler2 implements ActionListener // anonymous inner class
    {
        public void actionPerformed(ActionEvent e) {
            String st1 = t1.getText();
            String st2 = t2.getText();
            int x = Integer.parseInt(st1);
            int y = Integer.parseInt(st2);
            int z = x - y;
            String st3 = "";
            st3 = st3 + z;
            t3.setText(st3);

        }
    } // end anonymous inner class

    private class Handler3 implements ActionListener // anonymous inner class
    {
        public void actionPerformed(ActionEvent e) {
            String st1 = t1.getText();
            String st2 = t2.getText();
            int x = Integer.parseInt(st1);
            int y = Integer.parseInt(st2);
            int z = x * y;
            String st3 = "";
            st3 = Integer.toString(z);

            t3.setText(st3);
        }
    } // end anonymous inner class

    private class Handler4 implements ActionListener // anonymous inner class
    {
        public void actionPerformed(ActionEvent e) {
            t1.setText("");
            t2.setText("");
            t3.setText("");
        }
    } // end anonymous inner class

    // end call to addActionListener
} // end class ConvertFrame

Convert.java：

import javax.swing.JFrame;

public class Convert {
    public static void main(String[] args) {
        ConvertFrame convertFrame = new ConvertFrame();
        convertFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        convertFrame.setSize(500, 400); // set frame size
        convertFrame.setVisible(true); // display frame
    }
} // end class

Answer 1

如果你想在顶部堆叠文本字段

你应该改变这个

panel2.setLayout(new GridLayout(1, 5));

到这个

panel2.setLayout(new GridLayout(5, 1));

因为在new GridLayout(row, column)中第一个参数是行计数和下一个列计数。目前你有1行和5列。所以文本字段定位为coulmns。如果你想垂直定位那么你应该使用1列和5行

Answer 2

示例代码：

class Asset_Analysis(Base):
    #Tell SQLAlchemy what the table name is and if there's any table-specific arguments it should know about
    __tablename__ = 'Asset_Analysis'
    __table_args__ = {'sqlite_autoincrement': True}
    #tell SQLAlchemy the name of column and its attributes:
    id = Column(Integer, primary_key=True, nullable=False) 
    fid = Column(Integer, ForeignKey('Price_History.id'))

<强>输出：

MathFrame

注意：

使用GridBagLayout，这是一个更灵活的布局管理器。

使用GridBagConstraints
的不同属性，可以轻松完成组件的定位和重新调整大小前三个组件的
import java.awt.BorderLayout; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.GridLayout; import java.awt.Insets; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextField; @SuppressWarnings("serial") public class ConvertFrame extends JFrame { // Label to prompt user to enter Fahrenheit private final JLabel prompt; // Label to display temperature in Celsius private final JLabel display; /* // Textfield to enter temperature private final JTextField temperatureF;*/ // JButtons private JButton b1; private JButton b2; private JButton b3; private JButton b4; // JTextFields private JTextField t1; private JTextField t2; private JTextField t3; private JLabel operation; private JLabel equL; // constructor sets up GUI public ConvertFrame() { super("Math Frame"); prompt = new JLabel("Enter two numbers:"); operation = new JLabel("OPR"); equL = new JLabel("="); b1 = new JButton("ADD"); b2 = new JButton("SUB"); b3 = new JButton("MUL"); b4 = new JButton("CLEAR"); t1 = new JTextField(7); t2 = new JTextField(7); t3 = new JTextField(7); // Using GridBagLayout JPanel layoutPanel = new JPanel(new GridBagLayout()); GridBagConstraints c = new GridBagConstraints(); c.gridx = 0; c.gridy = 0; c.gridwidth = 4; c.anchor = GridBagConstraints.CENTER; c.insets = new Insets(10, 0, 20, 0); layoutPanel.add(prompt, c); c = new GridBagConstraints(); c.gridx = 0; c.gridy = 1; c.gridwidth = 4; c.ipadx = 20; c.anchor = GridBagConstraints.CENTER; c.insets = new Insets(10, 0, 10, 0); layoutPanel.add(t1, c); c = new GridBagConstraints(); c.gridx = 0; c.gridy = 2; c.gridwidth = 4; c.anchor = GridBagConstraints.CENTER; layoutPanel.add(operation, c); c = new GridBagConstraints(); c.gridx = 0; c.gridy = 3; c.gridwidth = 4; c.ipadx = 20; c.anchor = GridBagConstraints.CENTER; c.insets = new Insets(10, 0, 10, 0); layoutPanel.add(t2, c); c = new GridBagConstraints(); c.gridx = 0; c.gridy = 4; c.gridwidth = 4; c.anchor = GridBagConstraints.CENTER; layoutPanel.add(equL, c); c = new GridBagConstraints(); c.gridx = 0; c.gridy = 5; c.gridwidth = 4; c.ipadx = 20; c.insets = new Insets(10, 0, 10, 0); c.anchor = GridBagConstraints.CENTER; layoutPanel.add(t3, c); c = new GridBagConstraints(); c.gridx = 0; c.gridy = 6; c.insets = new Insets(30, 5, 10, 5); c.anchor = GridBagConstraints.CENTER; layoutPanel.add(b1, c); c = new GridBagConstraints(); c.gridx = 1; c.gridy = 6; c.insets = new Insets(30, 5, 10, 5); c.anchor = GridBagConstraints.CENTER; layoutPanel.add(b2, c); c = new GridBagConstraints(); c.gridx = 2; c.gridy = 6; c.insets = new Insets(30, 5, 10, 5); c.anchor = GridBagConstraints.CENTER; layoutPanel.add(b3, c); c = new GridBagConstraints(); c.gridx = 3; c.gridy = 6; c.insets = new Insets(30, 5, 10, 5); c.anchor = GridBagConstraints.CENTER; layoutPanel.add(b4, c); Handler1 h1 = new Handler1(); Handler2 h2 = new Handler2(); Handler3 h3 = new Handler3(); Handler4 h4 = new Handler4(); b1.addActionListener(h1); b2.addActionListener(h2); b3.addActionListener(h3); b4.addActionListener(h4); display = new JLabel(""); add(layoutPanel, BorderLayout.CENTER); // center region } // end ConvertFrame constructor private class Handler1 implements ActionListener // anonymous inner class { public void actionPerformed(ActionEvent e) { String st1 = t1.getText(); String st2 = t2.getText(); int x = Integer.parseInt(st1); int y = Integer.parseInt(st2); int z = x + y; String st3 = ""; st3 = st3 + z; t3.setText(st3); operation.setText("+"); } } // private class Handler2 implements ActionListener // anonymous inner class { public void actionPerformed(ActionEvent e) { String st1 = t1.getText(); String st2 = t2.getText(); int x = Integer.parseInt(st1); int y = Integer.parseInt(st2); int z = x - y; String st3 = ""; st3 = st3 + z; t3.setText(st3); operation.setText("-"); } } // end anonymous inner class private class Handler3 implements ActionListener // anonymous inner class { public void actionPerformed(ActionEvent e) { String st1 = t1.getText(); String st2 = t2.getText(); int x = Integer.parseInt(st1); int y = Integer.parseInt(st2); int z = x * y; String st3 = ""; st3 = Integer.toString(z); t3.setText(st3); operation.setText("*"); } } // end anonymous inner class private class Handler4 implements ActionListener // anonymous inner class { public void actionPerformed(ActionEvent e) { t1.setText(""); t2.setText(""); t3.setText(""); operation.setText("OPR"); } } // end anonymous inner class public static void main(String[] args) { ConvertFrame convertFrame = new ConvertFrame(); convertFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); convertFrame.setSize(500, 400); // set frame size convertFrame.setVisible(true); // display frame } } // end class ConvertFrame可以替换为c.gridwidth = 4;

GUI简单对齐的快速建议？

2 个答案: