MagicLen

Given:

public class Whizlabs {

    private String name;
    private boolean pass;

    public static void main(String[] args) {
        Whizlabs wb = new Whizlabs();
        System.out.print("name = " + wb.name);
        System.out.print(",pass = " + wb.pass);
    }
}

What would be the output, if it is executed as a program?

A.

name =, pass =

B.

name = null, pass = null

C.

name = null, pass = false

D.

name = null pass = true

E. Compile error.

題解

Java的類別或是物件欄位會按照不同資料型態自動給定初始值。初始值如下：

String、Object：null
byte、short、int、long、float、double：0
char：\0
boolean：false