Java中的数组默认初始化

public class Main {

    public static void main(String[] args) {
        int[] arrInt = new int[4];
        for(int k : arrInt) {
            System.out.print(k + " ");
        }
        System.out.println();
        String[] arrString = new String[4];
        for(String k : arrString) {
            System.out.print(k + " ");
        }
        System.out.println();
        double[] arrDouble = new double[4];
        for(double k : arrDouble) {
            System.out.print(k + " ");
        }
        System.out.println();
        char[] arrChar = new char[4];
        for(char k : arrChar) {
            System.out.print(k);
            System.out.print("-");
        }
        System.out.println();
        boolean[] arrBoo = new boolean[4];
        for(boolean k : arrBoo) {
            System.out.print(k + " ");
        }

    }

}

运行结果：
0 0 0 0 
null null null null 
0.0 0.0 0.0 0.0 
 - - - -
false false false false 

Java中，数组会默认初始化。其中，字符型默认初始化为“\u0000”，即为空格。