[자바] 기본개념 학습하기(indexOf, contains, charAt)

 

indexOf

public class Main {
    public static void main(String[] args) {
        // indexOf
        String a = "hello Java";
        System.out.println(a.indexOf("Java")); // 문자열 순서 숫자(0 부터)
	}
}

 

 

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contains

public class Main {
    public static void main(String[] args) {
        // contains
        String a = "Hello Java";
        System.out.println(a.contains("Java"));
	}
}

 

 

 

 

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charAt

public class Main {
    public static void main(String[] args) {
        // charAt
        String a = "Hello Java";
        System.out.println(a.charAt(6)); // 6번째 글자 리턴(0부터)
	}
}