import java.util.List;
import java.util.ArrayList;
import java.util.Set;
import java.util.HashSet;
public class lzwCode {

 public static void main(String [] args) {
  testA();
  System.out.println("===========================");
  testB();
  System.out.println("===========================");
  testC();
 }

 //去掉数组中重复的值
 public static void testA() {
  String [] str = {"Java", "C++", "Php", "C#", "Python", "C++", "Java"};
  for (String elementA:str ) {
   System.out.print(elementA + " ");
  }
    List<String> list = new ArrayList<String>();
  for (int i=0; i<str.length; i++) {
   if(!list.contains(str[i])) {
    list.add(str[i]);
   }
  }
  /*
  Set<String> set = new HashSet<String>();
  for (int i=0; i<str.length; i++) {
   set.add(str[i]);
  }
  String[] newStr = set.toArray(new String[1]); 
  */
  System.out.println();
  String[] newStr = list.toArray(new String[1]); //返回一个包含所有对象的指定类型的数组 
  for (String elementB:newStr ) {
   System.out.print(elementB + " ");
  }
  System.out.println();
 }

 //删除数组中其中一个元素
 public static void testB() {
  String [] str = {"Java", "C++", "Php", "C#", "Python"};
  for (String elementA:str ) {
   System.out.print(elementA + " ");
  }
  //删除php
  List<String> list = new ArrayList<String>();
  for (int i=0; i<str.length; i++) {
   list.add(str[i]);
  }
  list.remove(2); //list.remove("Php") 
  System.out.println();
  String[] newStr = list.toArray(new String[1]); //返回一个包含所有对象的指定类型的数组 
  for (String elementB:newStr ) {
   System.out.print(elementB + " ");
  } 
  System.out.println();
 }

 //在数组中增加一个元素
 public static void testC() {
  String [] str = {"Java", "C++", "Php", "C#", "Python"};
  for (String elementA:str ) {
   System.out.print(elementA + " ");
  }
  //增加ruby
  List<String> list = new ArrayList<String>();
  for (int i=0; i<str.length; i++) {
   list.add(str[i]);
  }
  list.add(2, "ruby"); //list.add("ruby") 
  System.out.println();
  String[] newStr = list.toArray(new String[1]); //返回一个包含所有对象的指定类型的数组 
  for (String elementB:newStr ) {
   System.out.print(elementB + " ");
  } 
  System.out.println();
 }
}