Java中Arrays常用方法

Java中Arrays的常用方法

java.util.Arrays
Arrays.sort() 对数组的排序(从小到大)
Arrays.binarySerch() 二分查找，找到则定位元素下标
Arrays.toString()数组的打印
Arrays.fill() 数组的填充
Arrays.equals() 判断两个数组大小是否相等
Arrays.asList() 查看数组中的特定值
Arrays.copyOf 数组的拷贝

	public static void main(String[] args) {
		returnArraysSort();
		returnArraysBinarySerch();
		returnArrayToString();
		returnArrayFill();
		returnArraysEquals();
		returnArraysAsList();
		returnArrayListCopyOf();		
	}
		
	/**
	 * Arrays.copyOf() :数组的拷贝
	 */
	public static void returnArrayListCopyOf() {
		int[] numGroup = {25,12,68,78,33,55};
		int[] numGroup02=null;
		numGroup02=Arrays.copyOf(numGroup, 9);
		System.out.println(Arrays.toString(numGroup02));
	}
	
	/**
	 * Arrays.asList() 查看数组中的特定值
	 */
	public static void returnArraysAsList() {
		int[] numGroup = {25,12,68,78,33,55};
		Boolean judge=Arrays.asList(numGroup).contains(numGroup);
		System.out.println("查看数组中的特定值:"+judge);
	}
	
	/**
	 * Arrays.asList() 判断两个数组是否相等
	 */
	public static void returnArraysEquals() {
		int[] numGroup = {25,12,68,78,33,55};
		int[] numGroup02 = {35,12,68,78,33,55};
		Boolean judge=Arrays.equals(numGroup, numGroup02);
		System.out.println("判断两个数组是否相等:"+judge);
	}
	
	/**
	 * Arrays.fill() 数组的填充
	 */
	public static void returnArrayFill() {
		int[] numGroup = {25,12,68,78,33,55};
		Arrays.fill(numGroup, 13);
		System.out.println("数组的填充:"+Arrays.toString(numGroup));
	}
	
	/**
	 * Arrays.toString() 打印数组内容
	 */
	public static void returnArrayToString() {
		int[] numGroup = {25,12,68,78,33,55};
		System.out.println("输出数组内容为:"+Arrays.toString(numGroup));
	}
	
	/**
	 * Arrays.binarySerch() 二分查找，找到则定位元素下标
	 */
	public static void returnArraysBinarySerch() {
		int[] numGroup = {25,12,68,78,33,55};
		int index=Arrays.binarySearch(numGroup, 12);
		System.out.println("该元素下标为:"+index);
	}
	
	/**
	 * Arrays.sort():对数组进行排序(由小到大)
	 */
	public static void returnArraysSort() {
		int[] numGroup = {25,12,68,78,33,55};
		Arrays.sort(numGroup);
		for (int i : numGroup) {
			System.out.print(i+"\t");
		}
	}