[VS] Cannot make a static reference to the non-static method ..... from the type ... Java(603979977)

Cannot make a static reference to the non-static method ㅁㅁㅁ from the type ㅁㅁㅁJava(603979977)

static 으로 동일 하게 맞춰주면된다. 

코드로 보면 이해된다. 

public class Compressed {

    public static void main(String[] args) {
        System.out.println("Hello");
        String show = "abbccccc";
        System.out.println(compress(show));
    }

    String compress(String str) {
        StringBuilder compressed = new StringBuilder();
        int countConsecutive = 0;
        for (int i = 0; i < str.length(); i++) {
            countConsecutive++;
            if (i + 1 >= str.length() || str.charAt(i) != str.charAt(i + 1)) {
                compressed.append(str.charAt(i));
                compressed.append(countConsecutive);
                countConsecutive = 0;
            }
        }
        return compressed.length() < str.length() ? compressed.toString() : str;
    }
}

아래와 같이 Static을 추가해주면 된다... 간단하다.

public class Compressed {

    public static void main(String[] args) {
        System.out.println("Hello");
        String show = "abbccccc";
        System.out.println(compress(show));
    }

    static String compress(String str) {
        StringBuilder compressed = new StringBuilder();
        int countConsecutive = 0;
        for (int i = 0; i < str.length(); i++) {
            countConsecutive++;
            if (i + 1 >= str.length() || str.charAt(i) != str.charAt(i + 1)) {
                compressed.append(str.charAt(i));
                compressed.append(countConsecutive);
                countConsecutive = 0;
            }
        }
        return compressed.length() < str.length() ? compressed.toString() : str;
    }
}

참고 블로그 

Cannot make a static reference to the non-static field 오류