Java array and sample code _java

The following is a 12 array operation method that obtains the maximum number of votes in the related question about array methods in StackOverflow.

1. Declare an array

string[] Aarray = new String[5]; 
String[] Barray = {"A", "B", "C", "D", "E"}; 

2. Output an array

Int[] Intarray = {1, 2, 3, 4, 5}; 
String intarraystring = arrays.tostring (intarray); 
  
Print directly'll print reference value 
System.out.println (intarray); 
[I@7150bd4d 
  
System.out.println (intarraystring); 
[1, 2, 3, 4, 5] 

3. Create an array list from an array

String[] Stringarray = {"A", "B", "C", "D", "E"}; 
arraylist<string> ArrayList = new Arraylist<string> (arrays.aslist (Stringarray)); 
System.out.println (arrayList); 
[A, B, C, D, E] 

4. Check whether an array contains a value

String[] Stringarray = {"A", "B", "C", "D", "E"}; 
Boolean B = Arrays.aslist (Stringarray). Contains ("a"); 
System.out.println (b); 
True 

5. Connect two arrays

Int[] Intarray = {1, 2, 3, 4, 5}; 
Int[] IntArray2 = {6, 7, 8, 9, ten}; 
Apache Commons Lang Library 

6. Declare an inline array (array inline)

Method (New string[]{"A", "B", "C", "D", "E"});

7. Put the provided array elements into a string

Containing the provided list of elements 
//Apache Common lang 
String j = stringutils.join (new string[] {"A" , "B", "C"}, ","); 
System.out.println (j); 
A, B, c 

8. Convert an array list to arrays

String[] Stringarray = {"A", "B", "C", "D", "E"}; 
arraylist<string> ArrayList = new Arraylist<string> (arrays.aslist (Stringarray)); 
string[] Stringarr = new string[arraylist.size ()]; 
Arraylist.toarray (Stringarr); 
for (String S:stringarr) 
  System.out.println (s); 

9. Convert an array to a set (set)

set<string> set = new Hashset<string> (arrays.aslist (Stringarray)); 
SYSTEM.OUT.PRINTLN (set); 
[D, E, B, C, a] 

10. Reverse an array

Int[] Intarray = {1, 2, 3, 4, 5}; 
Arrayutils.reverse (intarray); 
System.out.println (arrays.tostring (Intarray)); 
[5, 4, 3, 2, 1] 

11. Remove elements from the divisor group

Int[] Intarray = {1, 2, 3, 4, 5}; 
int[] removed = Arrayutils.removeelement (Intarray, 3);//create a new array 
System.out.println (arrays.tostring ( removed)); 

12. Convert an integer to a byte array

byte[] bytes = bytebuffer.allocate (4). Putint (8). Array (); 
  
for (byte t:bytes) { 
  System.out.format ("0x%x", t); 
} 

 

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