Java工具类之Arrays（一）

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Arrays主要是针对数组进行操作的工具类，主要设置到数据的排序，二分查找，数组转换成List，数组复制，数组初始化，数组toString整体输出等等功能。

package three.day.util.my;

import java.util.Arrays;
import java.util.List;

public class Arraysts {

/**
* @param args
*/
public static void main(String[] args) {
arraysTs();
arraysToString();
asList();

}

private static void arraysTs() {
int[] a = {1,2,7,4,5,4,6,4,666,1,2};
int index = Arrays.binarySearch(a, 4);
System.out.println(index);
System.out.println("排序前：");
System.out.println(Arrays.toString(a));
Arrays.sort(a);
System.out.println("排序后：");
System.out.println(Arrays.toString(a));
System.out.println("复制数组：");
System.out.println(Arrays.toString(Arrays.copyOf(a, a.length+10)));
System.out.println("复制数组：");
System.out.println(Arrays.toString(Arrays.copyOfRange(a, 4, 20)));
System.out.println("hashcode：");
System.out.println(Arrays.hashCode(a));
Arrays.fill(a, 1);
System.out.println("填充后：");
System.out.println(Arrays.toString(a));
int[] a1 = {1,2,7,4,5,4,6,4,666,1,2};
System.out.println("比较数据是否相等");
System.out.println(Arrays.equals(a, a));
}

private static void arraysToString() {
int[] a = {1,2,3,4,5};
System.out.println(Arrays.toString(a));
}

private static void asList() {
int[] a = {1,2,3,4,5};
List<int[]> list = Arrays.asList(a);
for(int it[] : list ){
for(int i : it )
System.out.println(i);
}
}

}