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862天前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(); |
} |
} |
