[JAVA] 선행 연산 / 후행 연산

선행연산

int j = 1;
System.out.println(++j);

j = j + 1 먼저 수행 후
System.out.println(j) 수행

후행연산

int k = 1;
System.out.println(k++);

System.out.println(k) 먼저 수행 후
k = k + 1 수행

예제

public class Ex4 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		int i = 0;
		++i;
		System.out.println(i);
		
		++i;
		System.out.println(i);
		
		++i;
		System.out.println(i);
		
		int j = 1;
		System.out.println(++j);	// 2 (j = j + 1)
		
		int k = 1;
		System.out.println(k++);	// 1
		System.out.println(k);		// 2
		
	}

}

public class Ex5 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		int i = 10;
		--i;	
		System.out.println(i);		// 9 
		
		--i;
		System.out.println(i);		// 8
		
		--i;
		System.out.println(i);		// 7
		
		System.out.println(--i);	// 6
		
		System.out.println(i--);	// 6
		
		System.out.println(i);		// 5
        
        	System.out.println("=========================");
		
		i = 10;
		int j = 10;
		int z = ++i + j++;
		System.out.println("z = " + z);	// 21
		System.out.println("i = " + i);	// 11
		System.out.println("j = " + j);	// 11
		
	}

}