数值元素的默认初始值

数值元素的默认初始值

package com.TroubleShooting.java;

public class TestArray1 {
    public static void main(String[] args){

        //基本数据类型变量创建的数组：byte,short,int,long,float,double,char,boolean
        //1.对于byte,int,short,long而言,创建数组默认为0
        int[] scores;
        scores = new int[4];
        scores[0]=88;
        scores[1]=83;
        //scores[2]=66;
        scores[3]=99;
        for(int i=0;i<scores.length;i++){
            System.out.println(scores[i]);
        }
        //2.对于float,double而言，默认为0.0
        double[] scores1;
        scores1 = new double[4];
        scores1[0]=88.1;
        scores1[1]=83.1;
        //scores1[2]=66.1;
        scores1[3]=99.2;
        for(int i=0;i<scores1.length;i++){
            System.out.println(scores1[i]);
        }
        //3.对于char而言，默认为空格
        char[] c=new char[4];
        for(int i=0;i<c.length;i++){
            System.out.println(c[i]);
        }
        //4.对于boolean类型，默认为false
        boolean[] b=new boolean[4];
        for(int i=0;i<c.length;i++){
            System.out.println(b[i]);
        }
        //5.对于引用数据类型变量构成的数组而言，默认为null
        String[] strs = new String[4];
        strs[0]="A";
        strs[1]="B";
        //strs[2]="C";
        strs[3]="D";
        for(int i=0;i<strs.length;i++){
            System.out.println(strs[i]);
        }
        System.out.println();
        Person[] pers = new Person[3];
        for(int i=0;i < pers.length;i++){
            System.out.println(pers[i]);
    }
}
    class Person{
        }
    }