[Java] 명품 자바 프로그래밍 10장 실습문제

1번

import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.*;

class Chapter10 extends JFrame{
    Chapter10(){
        setTitle("마우스 올리기 내리기");
        setDefaultCloseOperation(3);
        Container c = getContentPane();
        c.setLayout(new FlowLayout());
        JLabel label = new JLabel("Love Java");
        label.addMouseListener(new MouseAdapter() {
            public void mouseEntered(MouseEvent e){
                JLabel temp = (JLabel) e.getSource();
                temp.setText("사랑해");
            }
            public void mouseExited(MouseEvent e){
                JLabel temp = (JLabel) e.getSource();
                temp.setText("Love Java");
            }
        });
        c.add(label);
        setSize(300, 200);
        setVisible(true);
    }
    public static void main(String args[]){
        new Chapter10();
    }
}

 

2번

import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.*;

class Chapter10 extends JFrame{
    Chapter10(){
        setTitle("드래깅동안 Yellow");
        setDefaultCloseOperation(3);
        Container c = getContentPane();
        c.setLayout(new FlowLayout());
        c.setBackground(Color.GREEN);
        c.addMouseListener(new MouseAdapter() {
            public void mousePressed(MouseEvent e){
                Container temp = (Container) e.getSource();
                temp.setBackground(Color.YELLOW);
            }
            public void mouseReleased(MouseEvent e){
                Container temp = (Container) e.getSource();
                temp.setBackground(Color.GREEN);
            }
        });
        setSize(300, 200);
        setVisible(true);
    }
    public static void main(String args[]){
        new Chapter10();
    }
}

 

3번

import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.*;

class Chapter10 extends JFrame{
    Chapter10(){
        setTitle("Left 키로 문자열 교체");
        setDefaultCloseOperation(3);
        Container c = getContentPane();
        c.setLayout(new FlowLayout(FlowLayout.CENTER));
        JLabel label = new JLabel("Love Java");
        c.addKeyListener(new KeyAdapter() {
            public void keyPressed(KeyEvent e) {
                if(e.getKeyCode() == KeyEvent.VK_LEFT){
                    String text = label.getText();
                    if(text.equals("Love Java")){
                        label.setText("avaJ evoL");
                    }else{
                        label.setText("Love Java");
                    }
                }

            }
        });
        c.add(label);
        c.setFocusable(true);
        c.requestFocus();
        setSize(300, 200);
        setVisible(true);
    }
    public static void main(String args[]){
        new Chapter10();
    }
}

 

4번

import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.*;

class Chapter10 extends JFrame{
    Chapter10(){
        setTitle("Left 키로 문자열 교체");
        setDefaultCloseOperation(3);
        Container c = getContentPane();
        c.setLayout(new FlowLayout(FlowLayout.CENTER));
        JLabel label = new JLabel("Love Java");
        c.addKeyListener(new KeyAdapter() {
            public void keyPressed(KeyEvent e) {
                if(e.getKeyCode() == KeyEvent.VK_LEFT){
                    String text = label.getText();
                    label.setText(text.substring(1) + text.substring(0, 1));
                }
            }
        });
        c.add(label);
        c.setFocusable(true);
        c.requestFocus();
        setSize(300, 200);
        setVisible(true);
    }
    public static void main(String args[]){
        new Chapter10();
    }
}

 

5번

import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.*;

class Chapter10 extends JFrame{
    int size = 10;
    Chapter10(){
        setTitle("+,-로 폰트 크기 조절");
        setDefaultCloseOperation(3);
        Container c = getContentPane();
        c.setLayout(new FlowLayout(FlowLayout.CENTER));
        JLabel label = new JLabel("Love Java");
        label.setFont(new Font("Arial", Font.PLAIN, size));
        c.addKeyListener(new KeyAdapter() {
            public void keyPressed(KeyEvent e) {
                if(e.getKeyCode()==KeyEvent.VK_ADD || e.getKeyCode()==KeyEvent.VK_EQUALS){
                    size += 5;
                    label.setFont(new Font("Arial", Font.PLAIN, size));
                }
                else if(e.getKeyCode()==KeyEvent.VK_MINUS) {
                    size -= 5;
                    label.setFont(new Font("Arial", Font.PLAIN, size));
                }
            }
        });
        c.add(label);
        c.setFocusable(true);
        c.requestFocus();
        setSize(300, 200);
        setVisible(true);
    }
    public static void main(String args[]){
        new Chapter10();
    }
}

 

6번

import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.*;

class Chapter10 extends JFrame{
    Chapter10(){
        setTitle("클릭 연습용 프로그램");
        setDefaultCloseOperation(3);
        Container c = getContentPane();
        c.setLayout(null);
        JLabel label = new JLabel("c");
        label.setSize(10, 10);
        label.setLocation(100, 100);
        label.addMouseListener(new MouseAdapter() {
            public void mousePressed(MouseEvent e) {
                int x = (int)(Math.random() * 400);
                int y = (int)(Math.random() * 500);
                label.setLocation(x, y);
            }
        });
        c.add(label);
        setSize(500, 600);
        setVisible(true);
    }
    public static void main(String args[]){
        new Chapter10();
    }
}

 

7번

import java.awt.*;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;
import javax.swing.*;

class Chapter10 extends JFrame{
    int size = 10;
    Chapter10(){
        setTitle("마우스 휠을 굴려 폰트 크기 조절");
        setDefaultCloseOperation(3);
        Container c = getContentPane();
        c.setLayout(new FlowLayout(FlowLayout.CENTER));
        JLabel label = new JLabel("Love Java");
        label.setFont(new Font("Arial", Font.PLAIN, size));
        label.addMouseWheelListener(new MouseWheelListener() {
            public void mouseWheelMoved(MouseWheelEvent e) {
                int n = e.getWheelRotation();
                if(n < 0){
                    if(size - 5 > 0){
                        size -= 5;
                        label.setFont(new Font("Arial", Font.PLAIN, size ));
                    }
                }
                else{
                    size += 5;
                    label.setFont(new Font("Arial", Font.PLAIN, size + 5));
                }
            }
        });
        c.add(label);
        setSize(500, 600);
        setVisible(true);
    }
    public static void main(String args[]){
        new Chapter10();
    }
}