Thread 와 Array 를 이용한 예제

join 정렬 Thread 와 Array 를 이용한 예제

• 10마리의 말들이 경주를 하는 경마 프로그램을 작성하시오. 

말은 Horse라는 이름의 클래스로 구성하고
이 클래스는 말이름(String), 등수(int), 현재위치(int)를 멤버변수로 갖는다.
그리고 이 클래스에는 등수를 오름차순으로 처리할 수 있는 기능이 있다.(Comparable구현)

경기 구간은 1 ~ 50구간으로 되어 있다.

일정한 시간마다 말들의 위치를 출력한다.
예)
01번말  --->--------------------------
02번말  ------>-----------------------
03번말  -->---------------------------
...
10번말  ---->-------------------------

경기가 끝나면 등수 순으로 출력한다.

package basic;

import java.util.Arrays;

public class ThreadTest16 {

public static void main(String[] args) {
Horse[] horses = new Horse[]{
new Horse("01번말"),
new Horse("02번말"),
new Horse("03번말"),
new Horse("04번말"),
new Horse("05번말"),
new Horse("06번말"),
new Horse("07번말"),
new Horse("08번말"),
new Horse("09번말"),
new Horse("10번말")
};

PlayState state = new PlayState(horses);

for(Horse h : horses){
h.start();
}
state.start();


for(Horse h : horses){
try {
h.join();
} catch (InterruptedException e) {
}
}
try {
state.join();
} catch (InterruptedException e) {
}

System.out.println();
System.out.println("경기 끝........");
System.out.println();

// 경기 종료 후 등수순으로 정렬하기
Arrays.sort(horses);


System.out.println("경기 결과");
for(Horse h : horses){
System.out.println(h);
}


}

}


class Horse extends Thread implements Comparable{
public static int currentRank = 0;

private String horseName; // 말이름
private int rank; // 등수
private int location; // 현재위치

// 생성자
public Horse(String horseName) {
this.horseName = horseName;
}

public String getHorseName() {
return horseName;
}
public void setHorseName(String horseName) {
this.horseName = horseName;
}
public int getRank() {
return rank;
}
public void setRank(int rank) {
this.rank = rank;
}
public int getLocation() {
return location;
}
public void setLocation(int location) {
this.location = location;
}

@Override
public String toString() {
return "경주마 " + horseName + "는" + rank + "등 입니다.";
}

@Override
public int compareTo(Horse h) {
return Integer.compare(rank, h.getRank());
}

@Override
public void run() {
for(int i=1; i<=50; i++){
location = i;
try {
Thread.sleep((int)(Math.random()*400));
} catch (InterruptedException e) {
}
}
rank = ++Horse.currentRank;
}

}


// 경기 중의 현재 상황을 출력하는 쓰레드
class PlayState extends Thread{
private Horse[] horses;

// 생성자
public PlayState(Horse[] horses) {
this.horses = horses;
}

@Override
public void run() {
while(true){
if(Horse.currentRank == horses.length){  // 경기가 종료되면...
break;
}

for(int i=1; i<=10; i++){
System.out.println();
}


for(int i=0; i<horses.length; i++){
System.out.print(horses[i].getHorseName() + " : ");
for(int j=1; j<=50; j++){
if(horses[i].getLocation()==j){ // 현재위치 표시
System.out.print(">");
}else{
System.out.print("-");
}
}
System.out.println();
}

try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO: handle exception
}

}
}


}

말 경기 속도비교하기

경주마 프로그램

교수님 예시 정답 답안

 

package basic;

import java.util.Arrays;

public class ThreadTest16 {

	public static void main(String[] args) {
		Horse[] horses = new Horse[]{
			new Horse("01번말"),
			new Horse("02번말"),
			new Horse("03번말"),
			new Horse("04번말"),
			new Horse("05번말"),
			new Horse("06번말"),
			new Horse("07번말"),
			new Horse("08번말"),
			new Horse("09번말"),
			new Horse("10번말")
		};
		
		PlayState state = new PlayState(horses);
		
		for(Horse h : horses){
			h.start();
		}
		state.start();
		

		for(Horse h : horses){
			try {
				h.join();
			} catch (InterruptedException e) {
			}
		}
		try {
			state.join();
		} catch (InterruptedException e) {
		}
		
		System.out.println();
		System.out.println("경기 끝........");
		System.out.println();
		
		// 경기 종료 후 등수순으로 정렬하기
		Arrays.sort(horses);
		
		
		System.out.println("경기 결과");
		for(Horse h : horses){
			System.out.println(h);
		}
		

	}

}


class Horse extends Thread implements Comparable<Horse>{
	public static int currentRank = 0;
	
	private String horseName;	// 말이름
	private int rank;			// 등수
	private int location;		// 현재위치

	// 생성자
	public Horse(String horseName) {
		this.horseName = horseName;
	}
	
	public String getHorseName() {
		return horseName;
	}
	public void setHorseName(String horseName) {
		this.horseName = horseName;
	}
	public int getRank() {
		return rank;
	}
	public void setRank(int rank) {
		this.rank = rank;
	}
	public int getLocation() {
		return location;
	}
	public void setLocation(int location) {
		this.location = location;
	}
	
	@Override
	public String toString() {
		return "경주마 " + horseName + "는" + rank + "등 입니다.";
	}
	
	@Override
	public int compareTo(Horse h) {
		return Integer.compare(rank, h.getRank());
	}

	@Override
	public void run() {
		for(int i=1; i<=50; i++){
			location = i;
			try {
				Thread.sleep((int)(Math.random()*400));
			} catch (InterruptedException e) {
			}
		}
		rank = ++Horse.currentRank;
	}
	
}


// 경기 중의 현재 상황을 출력하는 쓰레드
class PlayState extends Thread{
	private Horse[] horses;

	// 생성자
	public PlayState(Horse[] horses) {
		this.horses = horses;
	}
	
	@Override
	public void run() {
		while(true){
			if(Horse.currentRank == horses.length){  // 경기가 종료되면...
				break;
			}
			
			for(int i=1; i<=10; i++){
				System.out.println();
			}
			
			
			for(int i=0; i<horses.length; i++){
				System.out.print(horses[i].getHorseName() + " : ");
				for(int j=1; j<=50; j++){
					if(horses[i].getLocation()==j){ // 현재위치 표시
						System.out.print(">");
					}else{
						System.out.print("-");
					}
				}
				System.out.println();
			}
			
			try {
				Thread.sleep(100);
			} catch (InterruptedException e) {
				// TODO: handle exception
			}
			
		}
	}
	
	
}