dataType[] arrayRefVar;//首選方法
或
dataType arrayRefVar[];

dataType[] arrayRefVar = new dataType[arraySize];

int[] a = new int[5];

int[0] = 1; int[1] = 2;int[2] = 3;int[3] = 4;int[4] = 5;

int[] b = new int[]{1,2,3,4,5};

int[] c = {1,2,3,4,5};

package com.cnblogs;
/*
 * 本類用于測試數(shù)組01	遍歷數(shù)組
 */
public class TestArr1 {
	public static void main(String[] args) {
		int[] arr = {1,2,3,4,5,6,7,8,9};
		//遍歷數(shù)組
		for(int i = 0; i < arr.length ; i++) {
			System.out.print(arr[i] + " ");
		}
		System.out.println();
		System.out.println("=============================");
		//利用增強for循環(huán)遍歷數(shù)組
		for(int x : arr) {
			System.out.print(x + " ");
		}
		System.out.println();
		System.out.println("=============================");
		//使用自己定義的遍歷數(shù)組方法
		printArr(arr);
	}
	//定義一個遍歷數(shù)組的方法
	public static void printArr(int[] arr) {
		for(int i = 0; i < arr.length ; i++) {
			System.out.print(arr[i] + " ");
		}
	}
}

int[][] a = new int[2][5]//兩行，五列

package com.cnblogs;
/*
 * 本類用于測試數(shù)組01	遍歷二維數(shù)組
 */
public class TestArr2 {
	public static void main(String[] args) {
		int[][] arr = {{1,2},{2,3},{3,4},{4,5}};
		for(int i = 0 ; i < arr.length ; i++) {
			for(int j = 0 ; j < arr[i].length ; j++) {
				System.out.print(arr[i][j] + " ");
			}
			System.out.println();
		}
	}
}

package com.cnblogs;
/*
 * 本類用于測試數(shù)組03	Arrays類
 */
//導入Arrays類
import java.util.Arrays;
public class TestArr3 {
	public static void main(String[] args) {
		int[] arr = {1,2,3,4,5,6,28,15,13,9};
		System.out.println(arr);//[I@3fb6a447  這里打印的是內存地址
		//打印數(shù)組元素
		System.out.println(Arrays.toString(arr));//[1, 2, 3, 4, 5, 6, 28, 15, 13, 9]
		//數(shù)組進行排序,升序
        Arrays.sort(arr);
        System.out.println(Arrays.toString(arr));//[1, 2, 3, 4, 5, 6, 9, 13, 15, 28]
        //數(shù)組的填充
        Arrays.fill(arr,6);
        System.out.println(Arrays.toString(arr));//[6, 6, 6, 6, 6, 6, 6, 6, 6, 6]
        Arrays.fill(arr,2,4,8);//填充2-4  包括2 不包括4
        System.out.println(Arrays.toString(arr));//[6, 6, 8, 8, 6, 6, 6, 6, 6, 6]
	}
}