Java数组元素的默认初始化值

• 数组元素是整型默认初始化值为0
• 数组元素是浮点型默认初始化值为0.0
• 数组元素是char型默认初始化值为0或’\u0000’，而非字符型’0’
• 数组元素是boolean型默认初始化值为false
• 数组元素是引用数据类型默认初始化值为null

代码测试：

/**
 * @Author: YuShiwen
 * @Date: 2020/11/12 7:14 PM
 * @Version: 1.0
 */
public class ArrayTest {
    public static void main(String[] args) {

        //整型默认初始化值为0
        int[] arr = new int[3];
        for (int i : arr) {
            System.out.print(i);
        }
        System.out.println();
        byte[] arr1 = new byte[3];
        for (byte b : arr1) {
            System.out.print(b);
        }
        System.out.println();
        short[] arr2 = new short[3];
        for (short i : arr2) {
            System.out.print(i);
        }
        System.out.println();


        //浮点型默认初始化值为0.0
        float[] floats = new float[3];
        for (float aFloat : floats) {
            System.out.print(aFloat);
        }
        System.out.println();
        double[] doubles = new double[3];
        for (double aDouble : doubles) {
            System.out.print(aDouble);
        }
        System.out.println();

        //char型默认初始化值为0或'\u0000'，而非字符型'0'
        char[] chars = new char[3];
        for (char aChar : chars) {
            System.out.print(aChar);
        }
        System.out.println();
        if(chars[0] == 0){
            System.out.println("char型默认初始化值为0或'\\u0000'，而非字符型'0'");
        }

        //boolean默认初始化值为false
        boolean[] booleans = new boolean[3];
        for (boolean aBoolean : booleans) {
            System.out.print(aBoolean);
        }
        System.out.println();

        //引用数据类型为null
        String[] strings = new String[3];
        for (String string : strings) {
            System.out.print(string);
        }
    }
}


  

 

  
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测试结果：

000
000
000
0.00.00.0
0.00.00.0

char型默认初始化值为0或'\u0000'，而非字符型'0'
falsefalsefalse
nullnullnull
Process finished with exit code 0

  

 

  
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文章来源: blog.csdn.net，作者：Mr.Yushiwen，版权归原作者所有，如需转载，请联系作者。

原文链接：blog.csdn.net/MrYushiwen/article/details/109653837