자바 GUI, JFrame, BorderLayout, GridLayout, NullContainer

package java0806;

import java.awt.BorderLayout;

import java.awt.Container;

import javax.swing.JButton;

import javax.swing.JFrame;

public class BorderLayoutEx extends JFrame {

public BorderLayoutEx() {

setTitle("BorderLayout 연습");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container c = getContentPane();

c.setLayout(new BorderLayout(30, 20));

c.add(new JButton("계산하기"), BorderLayout.CENTER);

c.add(new JButton("덧셈"), BorderLayout.NORTH);

c.add(new JButton("뺄셈"), BorderLayout.SOUTH);

c.add(new JButton("곱셈"), BorderLayout.EAST);

c.add(new JButton("나눗셈"), BorderLayout.WEST);

setSize(300, 200);

setVisible(true);

}

public static void main(String[] args) {

new BorderLayoutEx();

}

}

package java0806;

import java.awt.Container;

import java.awt.GridLayout;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JTextField;

public class GridLayoutEx extends JFrame {

public GridLayoutEx() {

setTitle("GridLayout 연습");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

GridLayout grid = new GridLayout(4, 2);

grid.setVgap(5);

Container c = getContentPane();

c.setLayout(grid);

c.add(new JLabel("이름"));

c.add(new JTextField(""));

c.add(new JLabel("이름"));

c.add(new JTextField(""));

c.add(new JLabel("이름"));

c.add(new JTextField(""));

c.add(new JLabel("이름"));

c.add(new JTextField(""));

setSize(300, 200);

setVisible(true);

}

public static void main(String[] args) {

new GridLayoutEx();

}

}

package java0806;

import java.awt.Container;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

public class NullContainerEx extends JFrame {

public NullContainerEx() {

setTitle("Null Container 연습");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container c = getContentPane();

c.setLayout(null);

JLabel la = new JLabel("안녕, 버튼을 누르세요!");

la.setLocation(130, 50);  // 위치 

la.setSize(200, 20);  // 크기

c.add(la);

for (int i=0; i<=9; i++) {

JButton btn = new JButton(Integer.toString(i));

btn.setLocation(i*15, i*15);

btn.setSize(50, 20);

c.add(btn);

}

setSize(300, 200);

setVisible(true);

}

public static void main(String[] args) {

new NullContainerEx();

}

}