007 배열 Instance 확인

description :

 

배열을 선언하고 equals를 통해 객체의 call by value와 call by reference 를 연구한다.

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source code :

package exam007;

public class exam007 {

	public static void main(String[] args) {
		int [] myArray = {97, 89, 95};
		int [] compHash= {20, 50, 30};
		int [] cloneArray = myArray.clone();
		int [] refArray = myArray;
		
		
		System.out.print("myArray 요소 값 : ");
		for(int i = 0 ; i < myArray.length ; i++) {
			System.out.print(myArray[i]);
			if(i == myArray.length) {
				System.out.println(' ');
			}else{
				System.out.print(' ');
			}
		}
		System.out.println('\n');
		
		///////////////////////////////////////////////////////
		
		System.out.print("compHash 요소 값 : ");
		for(int i = 0 ; i < compHash.length ; i++) {
			System.out.print(compHash[i]);
			if(i == compHash.length) {
				System.out.println(' ');
			}else{
				System.out.print(' ');
			}
		}
		System.out.println('\n');
		
		///////////////////////////////////////////////////////
		
		System.out.print("cloneArray 요소 값 : ");
		for(int i = 0 ; i < cloneArray.length ; i++) {
			System.out.print(cloneArray[i]);
			if(i == cloneArray.length) {
				System.out.println(' ');
			}else{
				System.out.print(' ');
			}
		}
		System.out.println('\n');
		
		///////////////////////////////////////////////////////
		
		System.out.print("refArray 요소 값 : ");
		for(int i = 0 ; i < refArray.length ; i++) {
			System.out.print(refArray[i]);
			if(i == refArray.length) {
				System.out.println(' ');
			}else{
				System.out.print(' ');
			}
		}
		System.out.println('\n');
		
		if(myArray.equals(compHash)){
			System.out.println("myArray와 compHash는 같다.");
		}else {
			System.out.println("myArray와 compHash는 같지 않다.");
		}
		
		System.out.printf("myArray hash : %d \ncompHash hash : %d \n\n", myArray.hashCode(), compHash.hashCode());
		
		////////////////////////////////////////////////////////
		
		
		if(myArray.equals(cloneArray)){
			System.out.println("myArray와 cloneArray는 같다.");
		}else {
			System.out.println("myArray와 cloneArray는 같지 않다.");
		}
		
		System.out.printf("myArray hash : %d \ncloneArray hash : %d \n\n", myArray.hashCode(), cloneArray.hashCode());
		
		
		if(myArray.equals(refArray)){
			System.out.println("myArray와 refArray는 같다.");
		}else {
			System.out.println("myArray와 refArray는 같지 않다.");
		}
		
		System.out.printf("myArray hash : %d \nrefArray hash : %d \n\n", myArray.hashCode(), refArray.hashCode());
		
	}
}

 

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result :