Java数组，去掉重复值、增加、删除数组元素

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 list = new ArrayList();
		for (int i=0; i set = new HashSet();
		for (int i=0; i list = new ArrayList();
		for (int i=0; i list = new ArrayList();
		for (int i=0; i

控制台结果：