天易33----java数组的一些基本使用

执行结果预览：

代码预览：

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.apache.commons.lang.ArrayUtils;

public class Test2 {

/**
* @param args
* 注：ArrayUtils包引自apache：commons-lang-2.3.jar包
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
//String[] stringArray = {"1","5","7","3"};
//String[] stringArray1 = {"1","5","7","3"};
int[] stringArray = {1,5,7,3};
int[] stringArray1 = {1,5,7,3};
Arrays.sort(stringArray);//对数组进行排序
System.out.println("对数组元素进行排序进行排序：");
Test2.output(stringArray);
System.out.println("两组数组数据是否相等："+Arrays.equals(stringArray, stringArray1));//注意：stringArray这里已经进行了排序

//从数组中创建数组列表
String[] array = { "1","5","7","3" };
List<String> arrayList = new ArrayList<String>(Arrays.asList(array));
System.out.println("myarrayList======>>>"+arrayList);
System.out.println("array======>>>"+array[2]);
//字符串数组中是否包含某个特定值
boolean b = Arrays.asList(array).contains("1");
System.out.println("b=======>>>"+b);
//整型数组中是否包含某个特定值
int[] i={0,6,5,4,6,8,9,9,9};
Arrays.sort(i);//判断整型数组中是否包含某个特定值，需要对这个数组进行排序
System.out.println("i===========>>>"+ Arrays.binarySearch(i, 9));//如果返回值>=0,则存在,返回值<0，则不存在
//for(int i=0;i<arrayList.size();i++){
for(String ub:arrayList){
// System.out.println("arrayListinfo====>>>"+arrayList.get(i));
System.out.println("ub====>>>"+ub);
}
//连接两个数组（ Concatenate two arrays）
//int[] intArray1 = { 1, 2, 3, 4, 5, 6 };
//int[] intArray2 = { 6, 7, 8, 9, 10 };
String[] intArray1 = { "1","2","3","4" };
String[] intArray2 = { "4","3","2","1" };
//int[] combinedIntArray = ArrayUtils.addAll(intArray1, intArray2);
String[] combinedIntArray = (String[]) ArrayUtils.addAll(intArray1, intArray2);
for(String in : combinedIntArray){
System.out.println("combinedIntArray========>>>>"+in);
}
//将数组转换成一个集合
Set<String> set = new HashSet<String>(Arrays.asList(array));
System.out.println("set=======>>>>"+set);

//反向数组（倒序排序）
int[] intArray = { 1, 2, 3, 4, 5 };
ArrayUtils.reverse(intArray);
System.out.println("intArray=======>>>"+Arrays.toString(intArray));

//删除数组元素（Remove element of an array）
//int[] removeArray = { 1, 2, 3, 4, 5 };
String[] removeArray={"5","4","2","9"};
//int[] removed = ArrayUtils.removeElement(removeArray, 3);
String[] removed = (String[]) ArrayUtils.removeElement(removeArray, "4");
System.out.println("removed=======>>>>>"+Arrays.toString(removed));

//调用getDouble方法
String str="1,2,5,3,4";
double strr[]=getDouble(str);
for(double dou : strr){
System.out.print("dou==========>>>>"+dou+" ");
}

}
//字符串转换成double数组
public static double[] getDouble(String str) {
String[] sFirst = str.split(",");
double[] doubl = new double[sFirst.length];
for (int j = 0; j < sFirst.length; j++) {
doubl[j] = Double.parseDouble(sFirst[j]);
}
return doubl;
}
//public static void output(String[] array) {
public static void output(int[] array) {
if (array!=null) {
for (int i = 0; i < array.length; i++) {
System.out.print(array[i]+" ");
}
}
System.out.println();
}

}