枚举类比较的陷阱

public class TestTypeTest {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        
        String feedback = "feedback";
        if(TestType.FEEDBACK.equals(feedback)){
            System.out.println("equal"+TestType.FEEDBACK); 
        }else{
            System.out.println("no"+TestType.FEEDBACK);
        }
        
        if(TestType.FEEDBACK.toString().equals(feedback)){
            System.out.println("equal"+TestType.FEEDBACK.toString());
        }else{
            System.out.println("no"+TestType.FEEDBACK.toString());
        }

        //这种才没问题
        if(TestType.FEEDBACK.getFieldType().equals(feedback)){
            System.out.println("equal"+TestType.FEEDBACK.toString());
        }else{
            System.out.println("no"+TestType.FEEDBACK.toString());
        }
    }

}

public enum TestType {

    FEEDBACK("feedback");
    
    
        
    private String fieldType;

    private TestType(String fieldType) {
        this.fieldType = fieldType;
    }

    public String getFieldType() {
        return fieldType;
    }

    public static TestType getFieldType(String fieldType) {
        for (TestType type : TestType.values()) {
            if (type.getFieldType().equalsIgnoreCase(fieldType)) {
                return type;
            }
        }
        return null;
    }
}