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SCJP 5.0 Enum Mock Questions - 3(15 Questions)

3) What will be the output of the following program?

package enums;
public enum Color {
	RED("Red Color"),
	GREEN("Blue Color"),
	BLUE("Blue Color");
	private String displayName;
	Color(String displayName){
		this.displayName = displayName;
	}
	public String toString(){
		return displayName;
	}
}

class ColorTest{
	public static void main(String[] args) {
		Color redColor = Color.RED;
		System.out.println(redColor);
		Color blueColor = Color.BLUE;
		System.out.println(blueColor);
	}
}

1. The program will compile and the output will be 'Red Color' followed by 'Blue Color'.
2. The program will compile and throw a run-time exception.
3. The program won't compile as it is not possible to define methods within an Enum.

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Answer

3)1
The above program defines a Enum called Color and the Enum constants within are parameterized by defining a constructor for holding the display name of each constants. The method toString() is defined at the declaration level which means that when an Enum object is printed, this method will get called.

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