JComponent

package chapter8;

import javax.swing.*;

import java.awt.*;

public class FrameSample extends JFrame{

FrameSample(){

setTitle("Let's study Java");

setSize(400,200);

setVisible(true);

}

public static void main(String[] args){

FrameSample fs =new FrameSample();

fs.setDefaultCloseOperation(fs.EXIT_ON_CLOSE);

}

}

실행결과

package chapter8;

import javax.swing.*;

import java.awt.*;

public class BorderLayoutSample extends JFrame{

BorderLayoutSample(){

setTitle("BorderLayout Practice");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container contentPane = getContentPane();

contentPane.setLayout(new BorderLayout(5,7));

contentPane.add(new JButton("North"), BorderLayout.NORTH);

contentPane.add(new JButton("West"), BorderLayout.WEST);

contentPane.add(new JButton("Center"), BorderLayout.CENTER);

contentPane.add(new JButton("East"), BorderLayout.EAST);

contentPane.add(new JButton("South"), BorderLayout.SOUTH);

setSize(400,200);

setVisible(true);

}

public static void main(String[] args){

BorderLayoutSample bl = new BorderLayoutSample();

}

}

실행결과

package chapter8;

import java.awt.*;

import javax.swing.*;

public class FlowLayoutSample extends JFrame {

public FlowLayoutSample() {

setTitle("FlowLayout Practice");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container c = getContentPane();

c.setLayout(new FlowLayout());

c.add(new JLabel("100"));

c.add(new JLabel("+"));

c.add(new JLabel("200"));

c.add(new JButton("="));

c.add(new JLabel("300"));

setSize(400,100);

setVisible(true);

}

public static void main(String[] args) {

FlowLayoutSample fl= new FlowLayoutSample();

}

}

실행결과

package chapter8;

import javax.swing.*;

import java.awt.*;

public class TenColorButtonFrame extends JFrame{

TenColorButtonFrame(){

setTitle("Ten Color Button Frame");

setSize(500,200);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container c = getContentPane();

c.setLayout(new GridLayout(1,10));

for(int i=0;i<10;i++){

Color [] color = {Color.RED, Color.ORANGE, Color.YELLOW,

                Color.GREEN, Color.CYAN, Color.BLUE,

                Color.MAGENTA, Color.GRAY, Color.PINK, Color.LIGHT_GRAY};

String text = Integer.toString(i);

JButton button = new JButton(text);

button.setOpaque(true);

button.setBackground(color[i]);

c.add(button);

}

setVisible(true);

}

public static void main(String[] args){

TenColorButtonFrame gl = new TenColorButtonFrame();

}

}

실행결과

package chapter8;

import java.awt.*;

import javax.swing.*;

public class GridLayoutSamples extends JFrame {

public GridLayoutSamples() {

setTitle("4x4 Color Frame");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Container c = getContentPane();

c.setLayout(new GridLayout(4, 4));

JLabel [] label = new JLabel [16];

Color [] color = {Color.RED, Color.ORANGE, Color.YELLOW, Color.GREEN,

Color.CYAN, Color.BLUE, Color.MAGENTA, Color.GRAY,

Color.PINK, Color.LIGHT_GRAY, Color.WHITE, Color.DARK_GRAY,

Color.BLACK, Color.ORANGE, Color.BLUE,Color.MAGENTA}; 

for(int i=0; i<label.length; i++) {

label[i] = new JLabel(Integer.toString(i));

label[i].setOpaque(true);

label[i].setBackground(color[i]);

c.add(label[i]);

}

setSize(500,200);

setVisible(true);

}

public static void main(String[] args) {

GridLayoutSamples gl = new GridLayoutSamples();

}

}

실행결과

package chapter8;

import javax.swing.*;

import java.awt.*;

public class RandomLabels extends JFrame {

RandomLabels(){

setTitle("Random Labels");

setSize(300,300);

Container c = new Container();

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

for(int i=0;i<20;i++){

JLabel label = new JLabel();

int x = (int)(Math.random()*200) + 50;

int y = (int)(Math.random()*200) + 50;

label.setBounds(x, y, 10, 10);

label.setOpaque(true);;

label.setBackground(Color.BLUE);

c.add(label);

}

this.add(c);

setVisible(true);

}

public static void main(String[] args){

RandomLabels rl = new RandomLabels();

}

}

실행결과

코드

package chapter7;

import java.util.*;

public class VectorBig {

public static void main(String[] args) {

Vector<Double> v = new Vector<Double>();

Scanner scanner = new Scanner(System.in);

for (int i = 0; i < 5; i++) {

double d = scanner.nextDouble();

v.add(d);

}

double max = v.get(0);

for(int i=0;i<5;i++){

if(max < v.get(i)) max = v.get(i);

}

System.out.println("가장 큰 수는 " + max);

}

}

실행결과

코드

package chapter7;

import java.util.*;

public class ArrayListCode {

public static void main(String[] args) {

ArrayList<String> al = new ArrayList<String>();

Scanner scanner = new Scanner(System.in);

System.out.print("빈 칸으로 분리하여 5개의 학점을 입력(A/B/C/D/F)>>");

for (int i = 0; i < 5; i++) {

String s = scanner.next();

al.add(s);

switch (s) {

case "A":

System.out.print("4.0" + " ");

break;

case "B":

System.out.print("3.0" + " ");

break;

case "C":

System.out.print("2.0" + " ");

break;

case "D":

System.out.print("1.0" + " ");

break;

case "F" :

System.out.print("0.0" + " ");

break;

}

}

}

}

실행결과

코드

package chapter7;

import java.util.*;

public class HashMapNation {

public static void main(String[] args){

System.out.println("나라 이름과 인구를 5개 입력하세요(예 : Korea 5000)");

HashMap<String, Integer> h = new HashMap<String,Integer>();

Scanner scanner = new Scanner(System.in);

for(int i=0;i<5;i++){

System.out.print("나라 이름, 인구 >>");

String nation = scanner.next();

int population = scanner.nextInt();

h.put(nation,population);

}

int max = 0;

String nation = "";

Set<String> names = h.keySet();

Iterator<String> it = names.iterator();

while(it.hasNext()){

String name = it.next();

int n = h.get(name);

if(max < n){

max = n;

nation = name;

}

}

System.out.println("제일 인구가 많은 나라는 (" + nation +"," + max +")");

}

}

실행결과

코드

package chapter7;

import java.util.*;

public class TallManager {

public static void main(String[] args){

Vector<Integer> v = new Vector<Integer>();

Scanner scanner = new Scanner(System.in);

System.out.println("2000 ~ 2009년 까지 1년단위로 키(cm)를 입력>>");

for(int i = 0; i <10;i++)

v.add(scanner.nextInt());

int max = v.get(1) - v.get(0);

int year = 0;

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

int x = v.get(i+1) - v.get(i);

if(max<x){

max = x;

year = 2000 +i;

}

}

System.out.println("가장 키가 많이 자란 년도는 " + year + "년 " + max +"cm");

}

}

실행결과

코드

package chapter7;

import java.util.*;

class Location {

private int x, y;

public Location() {}

public Location(int x, int y) {this.x = x; this.y = y;}

public int getX() {return x;}

public int getY() {return y;}

}

public class TravelManager {

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

ArrayList<Location> al = new ArrayList<Location>();

System.out.println("쥐가 이동한 위치(x,y)를 5개 입력하라.");

al.add(new Location(0, 0));

for (int i = 0; i < 5; i++) {

System.out.print(">>");

al.add(new Location(scanner.nextInt(), scanner.nextInt()));

}

al.add(new Location(0, 0));

double sum, tz = 0;

for (int i = 1; i < al.size(); i++) {

Location p = al.get(i - 1);// 이전 위치

double x = p.getX();

double y = p.getY();

Location p2 = al.get(i);// 현재 위치

double x2 = p2.getX();

double y2 = p2.getY();

double tx = x2 - x;

double ty = y2 - y;

sum = (tx * tx) + (ty * ty); // 피타고라스 정리

tz = tz + Math.sqrt(sum); // 제곱근, 이동거리 누적

}

System.out.println("총 이동 거리는 " + tz);

}

}

실행결과

코드

package chapter7;

import java.util.*;

public class CustomManager {

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

HashMap<String, Integer> h = new HashMap<String, Integer>();

System.out.println("** 포인트 관리 프로그램입니다 **");

while (true) {

System.out.print("이름과 포인터 입력>>");

String name = scanner.next();

int point = scanner.nextInt();

if (h.containsKey(name)) { 

h.put(name, h.get(name) + point);

} else {

h.put(name, point);

}

Set<String> key = h.keySet();

Iterator<String> it = key.iterator();

while (it.hasNext()) {

String n = it.next();

int p = h.get(n);

System.out.print("(" + n + "," + p + ")");

}

System.out.println();

}

}

}

실행결과