Question

用JAVA编写代码，实现一个窗口，窗口上有“姓名”“性别”“年龄”等标签，标签后分别对应3个文本框。

Answer 1

这个是网格布局，教程在这里：http://www.java2s.com/CN/Tutorial/Java/0240__Swing/Usesa2columngrid.htm

下面是我改自教程的，实现了你的要求：
import java.awt.ComponentOrientation;
import java.awt.Container;
import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JFrame;

public class GridLayoutDemo {
public final static boolean RIGHT_TO_LEFT = false;

public static void addComponentsToPane(Container pane) {
if (RIGHT_TO_LEFT) {
pane.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
}

pane.setLayout(new GridLayout(0, 2));

pane.add(new JLabel("姓名"));
pane.add(new JTextField());
pane.add(new JLabel("性别"));
pane.add(new JTextField());
pane.add(new JLabel("年龄"));
pane.add(new JTextField());

}

public static void main(String[] args) {
JFrame frame = new JFrame("GridLayoutDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

addComponentsToPane(frame.getContentPane());

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