Java에서 list 등을 루프돌면서 처리하는 4가지 방법

Here i show you four ways to loop a List in Java.

1. Iterator loop
2. For loop
3. For loop (Adcance)
4. While loop

package com.mkyong.core;
 
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
 
public class ArrayToList {
     public static void main(String[] argv) {
 
	String sArray[] = new String[] { "Array 1", "Array 2", "Array 3" };
 
	// convert array to list
	List<String> lList = Arrays.asList(sArray);
 
	// iterator loop
	System.out.println("#1 iterator");
	Iterator<String> iterator = lList.iterator();
	while (iterator.hasNext()) {
		System.out.println(iterator.next());
	}
 
	// for loop
	System.out.println("#2 for");
	for (int i = 0; i < lList.size(); i++) {
		System.out.println(lList.get(i));
	}
 
	// for loop advance
	System.out.println("#3 for advance");
	for (String temp : lList) {
		System.out.println(temp);
	}
 
	// while loop
	System.out.println("#4 while");
	int j = 0;
	while (j < lList.size()) {
		System.out.println(lList.get(j));
		j++;
	}
    }
}

Output

#1 iterator
Array 1
Array 2
Array 3
#2 for
Array 1
Array 2
Array 3
#3 for advance
Array 1
Array 2
Array 3
#4 while
Array 1
Array 2
Array 3