大数

public String solution(int[] numbers) {
       			String answer = "";
    			String[] result = new String[numbers.length];

    			for (int i = 0; i < numbers.length; i++) {
    				result[i] = String.valueOf(numbers[i]);
    			}

    			// 정렬
    			Arrays.sort(result, new Comparator<String>() {

    				@Override
    				public int compare(String o1, String o2) {

    					return ((o2 + o1).compareTo(o1 + o2));
    				}
    			});

    			//0만 있을 경우 [0,0,0,0] 0을 리턴
    			if(result[0].equals("0")) {
    				return "0";
    			}

    			for(int i = 0; i < result.length; i++) {
    				answer += result[i];
    			}
        return answer;
    }

Collections.sort(list, new Comparator<String>(){

@Override
    public int compare(String o1, String o1){
    	if(o1 > o2) {return 1;}
        else if( o1 < o2 ) { return 1;}
        else {return 0;}
})