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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();
}
}
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控制台结果:
以上就是小编为大家带来的Java数组,去掉重复值、增加、删除数组元素的方法全部内容了,希望大家多多支持服务器之家~