[Day 12]公費0412-内容整理

🌞マルチスレッド

class Person {
	String name;
	
	public Person(String name) {
		this.name = name;
	}
	
	public void sayHello() {
		for(int i=1; i<=10; i++) {
			System.out.println("Hello" + name + "! " + i);
		}
 	}
}


public class PersonTest {

	public static void main(String[] args) {
		Person p1 = new Person("김유신");
		Person p2 = new Person("홍길동");
		p1.sayHello();
		p2.sayHello();

	}

}

Hello김유신! 1
Hello김유신! 2
Hello김유신! 3
Hello김유신! 4
Hello김유신! 5
Hello김유신! 6
Hello김유신! 7
Hello김유신! 8
Hello김유신! 9
Hello김유신! 10
Hello홍길동! 1
Hello홍길동! 2
Hello홍길동! 3
Hello홍길동! 4
Hello홍길동! 5
Hello홍길동! 6
Hello홍길동! 7
Hello홍길동! 8
Hello홍길동! 9
Hello홍길동! 10

🌞Javaでのマルチスレッドのプログラミング

🌞インタフェースを使用する理由

class MyBall extends JPanel implements Runnable {
		
		}

🌞スレッド優先度の設定

setPriority(int newPriority)
	우선순위에 설정할 수 있는 값은 1~10
	
	public static final int MAX_PRIORITY	10 			
	public static final int MIN_PRIORITY	1
	public static final int NORM_PRIORITY	5

🌞paintComponent

🌞りんかいいき

🌞スレッド間通信

🌈wait()

🌈notify()

🌞例

🌟(マルチスレッド)例1🌟

//멀티쓰레드의 필요성
class Person {
	String name;
	
	public Person(String name) {
		this.name = name;
	}
	
	public void sayHello() {
		for(int i=1; i<=10; i++) {
			System.out.println("Hello" + name + "! " + i);
		}
 	}
}


public class PersonTest {

	public static void main(String[] args) {
		Person p1 = new Person("김유신");
		Person p2 = new Person("홍길동");
		p1.sayHello();
		p2.sayHello();

	}

}

🌟(マルチスレッド)例2🌟

class Person extends Thread {
	private String name;

	public Person(String name) {
		this.name = name;
	}

	@Override
	public void run() {
		for (int i = 1; i <= 10; i++) {
			System.out.println("Hello, " + name + " " + i);

			try {
				Thread.sleep(100); // 대기시간을 생성 , 컴퓨터를 0.1초 멈추도록 한다.
			} catch (Exception e) {

			}
		}
	}

}

public class PersonTest {

	public static void main(String[] args) {
		Person p1 = new Person("홍길동");
		Person p2 = new Person("이순신");
		
//		p1.run(); //일반메소드로 호출하여 p1이 끝나야만 p2를 실행함.
//		p2.run();
		
		p1.start(); //둘이 공평하게 실행할 수 있게 끔 
		p2.start();

	}

}

🌟(JPanel)例2🌟

import java.awt.Color;
import java.awt.Graphics;

import javax.swing.JFrame;
import javax.swing.JPanel;


class RedBall extends JPanel {

	@Override
	protected void paintComponent(Graphics g) {
		//빨간색으로 색상을 선택
		g.setColor(Color.red);
		
		//채운 원을 그리기.
		g.fillOval(10, 220, 30, 30);
	}
	
}


class MyFrame extends JFrame {
	
	RedBall rb;
	
	public MyFrame() {
		rb = new RedBall();
		add(rb);
		setSize(400, 300);
		setVisible(true);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}



public class RedBallTest {

	public static void main(String[] args) {
		new MyFrame();
	}

}

🌞練習問題

👑練習問題1👑

import practice01.Count.CountDownEvent;

//pdf 01번문제 (쓰레드연습)

class Count extends Thread {
	protected int count;

	public Count(int count) {
		this.count = count;

	}

	@Override
	public void run() {
		for (int i = count; i >=1; i--) {
			System.out.println(i + "초 전입니다.");

			try {
				Thread.sleep(1000);
			} catch (Exception e) {

			}
		}
		System.out.println("발사 !!!");
	}

	class CountDownEvent extends Count {
		private int time;
		private String msg;
		public CountDownEvent(int count, int time) {
			super(count);
			this.time = time;
		}

		@Override
		public void run() {
			for (int i = 1; i <= 20; i--) {
				System.out.println(i + "초 전입니다.");

				try {
					Thread.sleep(100);
				} catch (Exception e) {
					System.out.println("대기시간이 지났습니다.");
				}
			}

		}
	}
}

public class ThreadPractice {

	public static void main(String[] args) {
		Count c = new Count(20);
//		CountDownEvent c1 = new CountDownEvent(20, 30, )
		c.start();
	}

}