Java类成员变量的默认值

不确定的时候看一下，很有用的

//Java类成员变量的默认值
public class Test {
    private boolean bool;
    private byte bt;
    private short st;
    private char ch;
    private int  i;
    private long l;
    private float f;
    private double d;
    private String str;
    public static void main(String[] args){
//        int j;
        Test test=new Test();
        System.out.println(test.bool);//默认值是false
        System.out.println(test.bt);//默认值是0
        System.out.println(test.st);//默认值是0
        System.out.println(test.ch);//默认值是空字符（'u0000'）
        System.out.println(test.i);//默认是0
        System.out.println(test.l);//默认是0
        System.out.println(test.f);//默认是0.0
        System.out.println(test.d);//默认是0.0
        System.out.println(test.str);//默认是null
//        System.out.println(j);//The local variable j may not have been initialized(变量可能没有被初始化)
    }

}