package myjava;
/**
* 数组
* @author Administrator
*
*/
import java.util.*;
public class Myarray {
public static void main(String args[]) {
// 数组排序
int array[] = { 1, 9, 4, 2, 8, 6, 7 };
Arrays.sort(array);
// 数组输出
for (int item : array) {
System.out.println(item);
}
// 数组转字符串
String str = Arrays.toString(array);
System.out.println(str);
// 获取数组长度
System.out.println("数组长度为：" + array.length);
int[][] newArray = new int[2][5];
System.out.println("第二维数组长度: " + newArray[0].length);
// 数组反转
ArrayList arrayList = new ArrayList();
arrayList.add("a");
arrayList.add("b");
arrayList.add("c");
Collections.reverse(arrayList);
System.out.println("反转后排序: " + arrayList);
// 数组最大值最小值
Integer[] numners = { 8, 3, 6, 1, 4, 7 };
int min = (int) Collections.min(Arrays.asList(numners));
int max = (int) Collections.max(Arrays.asList(numners));
System.out.println("最小值为: " + min);
System.out.println("最大值为: " + max);
// 数组合并
String a[] = { "a", "b", "c" };
String b[] = { "d", "e" };
List list = new ArrayList(Arrays.asList(a));
list.addAll(Arrays.asList(b));
Object[] c = list.toArray();
System.out.println("数组C为：" + Arrays.toString(c));
// 数组填充
int array2[] = new int[6];
Arrays.fill(array2, 100);
System.out.println("填充后的数组为：" + Arrays.toString(array2));
// 数组扩容
String[] names = new String[] { "A", "B", "C" };
String[] extended = new String[5];
extended[3] = "D";
extended[4] = "E";
System.arraycopy(names, 0, extended, 0, names.length);
for (String row : extended) {
System.out.println(row);
}
// 删除数组元素
ArrayList arrayList2 = new ArrayList();
arrayList2.clear();
arrayList2.add(0, "第 0 个元素");
arrayList2.add(1, "第 1 个元素");
arrayList2.add(2, "第 2 个元素");
arrayList2.remove(1);
System.out.println("数组删除元素后："+arrayList2);
}
}
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