Java创建数组的三种形式
测试类：
package cn.wsyjlly.base;
import java.util.Arrays;
/**
* @author wsyjlly
* @create 2019.08.18 - 15:11
**/
public class StringOperator {
public static void main(String[] args) {
//方式一：声明并赋初值，声明和赋值不可以分开写
String[] str1 = {"aaa","bbb","ccc"};
//方式二：先声明，后赋值，声明和赋值可以分开写。
String[] str2 = new String[]{"aaa","bbb","ccc"};
//方式三：先声明，后赋默认值，声明和赋值可以分开写。
String[] str3;
str3 = new String[3];
Character[] str4 = new Character[3];
Integer[] str5 = new Integer[3];
char[] str6 = new char[3];
byte[] str7 = new byte[3];
short[] str8 = new short[3];
int[] str9 = new int[3];
long[] str10 = new long[3];
float[] str11 = new float[3];
double[] str12 = new double[3];
boolean[] str13 = new boolean[3];
System.out.println(Arrays.toString(str1));
System.out.println(Arrays.toString(str2));
System.out.println(Arrays.toString(str3));
System.out.println(Arrays.toString(str4));
System.out.println(Arrays.toString(str5));
System.out.println("char"+Arrays.toString(str6));
System.out.println("byte"+Arrays.toString(str7));
System.out.println("short"+Arrays.toString(str8));
System.out.println("int"+Arrays.toString(str9));
System.out.println("long"+Arrays.toString(str10));
System.out.println("float"+Arrays.toString(str11));
System.out.println("double"+Arrays.toString(str12));
System.out.println("boolean"+Arrays.toString(str13));
}
}测试结果：
[aaa, bbb, ccc]
[aaa, bbb, ccc]
[null, null, null]
[null, null, null]
[null, null, null]
char[ , , ]
byte[0, 0, 0]
short[0, 0, 0]
int[0, 0, 0]
long[0, 0, 0]
float[0.0, 0.0, 0.0]
double[0.0, 0.0, 0.0]
boolean[false, false, false]
