[해결 방법] java.lang.Error

☕ 기본 환경: IDE: Eclipse, Language: Java

 

발생 Error

Java에서 다음 Source Code를 실행할 경우,

public class PrimitiveError {
    public static void main(String[] args) {
    
        double a = 1.1;
        System.out.println(a.getClass());
    
    }

}

⭐ Unresolved compilation problem: 

Cannot invoke getClass() on the primitive type double 발생

 

 

Error 원인

Primitive type variable: getClass() 호출 불가능

Primitive type	Wrapper Class
boolean char byte / short / int / long float / double	Boolean Character Byte / Short / Integer / Long Float / Double

 

 

해결 방법

객체 선언을 위한 Wrapper class 사용: Double a = New Double(1.1);

public class PrimitiveError {
    public static void main(String[] args) {
    
        // double a = 1.1;
        Double a = new Double(1.1);
        System.out.println(a.getClass());
    
    }

}

// class java.lang.Double