【Java-문자열】문자열 자르기

 1. 설명 

Java로 문자열을 입력한 구분자를 기준으로 잘라서 List 또는 배열로 리턴하는 코드와

문자열을 잘라서 char자료형의 래퍼클래스인 Character의 List로 리턴하는 코드입니다.
 

2. 소스코드

- 메서드

	public List<String> makeListFromStr(String str, String separator, boolean isArrayList) {
		if (isNullOrEmpty(separator) || isNullOrEmpty(str))
			return null;

		List<String> res = isArrayList 
				? new ArrayList<String>(Arrays.asList(str.split(separator)))
				: new LinkedList<String>(Arrays.asList(str.split(separator)));

		if (res != null && 0 < res.size())
			return res;
		else
			return null;
	}
    
    
    public String [] makeArrayFromStr(String str, String separator) {
		if (isNullOrEmpty(separator) || isNullOrEmpty(str))
			return null;
		
		String [] res = str.split(separator);
		
		if (res != null && 0 < res.length) 
			return res;
		else 
			return null;
	}
    
    public List<Character> makeCharList(String str, boolean isArrayList) {
		if ( isNullOrEmpty(str))
			return null;
		
		List<Character> res = isArrayList
				? new ArrayList<Character>()
				: new LinkedList<Character>();
		
		for (char ch :  str.toCharArray()) {
			res.add((Character)ch);
		}
		
		if (res != null && 0 < res.size()) 
			return res;
		else 
			return null;
	}

- 메인 클래스 

public class Str_01_SplitStr {

	public static void main(String[] args) {
		StrUtil util = new StrUtil();
		
		System.out.println("---------- Start ----------");
		String example1 = "test1,test2,test3,test4,test5";
		String example2 = "test1\ttest2\ttest3\ttest4\ttest5";
		String example3 = "David";
		
		System.out.println("---------- (1) Make String Array From String split ----------");
		String [] exampleAry1 = util.makeArrayFromStr(example1);
		System.out.println(exampleAry1[1]);
		System.out.println(exampleAry1[4]);
		
		System.out.println("---------- (2) Make String ArrayList From String split ----------");
		List<String> exampleList1 = util.makeListFromStr(example1);
		listCheck(exampleList1);
		System.out.println(exampleList1);
		
		System.out.println("---------- (3) Make String LinkedList From String split ----------");
		List<String> exampleList2 = util.makeListFromStr(example2, "\\t", false);
		listCheck(exampleList2);
		System.out.println(exampleList2);
		
		System.out.println("---------- (4) Make Char Array From String ----------");
		char [] exampleAry2 = util.makeCharArry(example3);
		System.out.println(exampleAry2[1]);
		System.out.println(exampleAry2[4]);
		
		System.out.println("---------- (5) Make Character LinkedList From String ----------");
		List<Character> exampleList3 = util.makeCharList(example3, false);
		listCheck(exampleList3);
		System.out.println(exampleList3);

	}
	
	
	public static void listCheck(List<?> list) {
		if (list instanceof LinkedList<?>) {
			System.out.println("LinkedList");
		} else if (list instanceof ArrayList<?>) {
			System.out.println("ArrayList");
		} else {
			System.out.println(list.getClass().getName());
		}
	}
}

3. 실행결과 

4. 전체코드

https://github.com/leeyoungseung/template-java