Java Array Tips

Java Array Tips

0. Declare an array (Declare an array)

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1. string[] Aarray = new string[5];
2. String[] Barray = {"a","B","C", "D", "E"};
3. string[] CArray = new string[]{"a","B","C","D","E"};

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

1. Output an array from Java (print an array in Java)

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1. int[] intarray = { 1, 2,  3, 4, 5 };  
2. string intarraystring = arrays.tostring ( Intarray);   
3.    
4. // print  directly will print reference value  
5. System.out.println (intarray);   
6. // [[email protected]   
7.    
8. System.out.println (intarraystring);  
9. // [1, 2, 3, 4, 5]  

Int[] Intarray = {1, 2, 3, 4, 5}; String intarraystring = arrays.tostring (Intarray); Print directly would print reference valueSystem.out.println (intarray);//[Email protected] SYSTEM.OUT.PRINTLN ( intarraystring);//[1, 2, 3, 4, 5]

2. Create an array list from the array (create a ArrayListfrom an array)

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

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]

3. Check if the array contains a specific value (check if an array contains a certain value)

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

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

4. Connect two arrays (concatenate two arrays)

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1. Int[] Intarray = {1, 2, 3, 4, 5};
2. Int[] IntArray2 = {6, 7, 8, 9, 10};
3. Apache Commons Lang Library
4. int[] Combinedintarray = Arrayutils.addall (Intarray, intArray2);

Int[] Intarray = {1, 2, 3, 4, 5};int[] IntArray2 = {6, 7, 8, 9,};//Apache Commons Lang libraryint[] Combinedintarr ay = Arrayutils.addall (Intarray, intArray2);

5. Declare an array of inline chains (Declare an array inline)

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1. Method (new string[]{"a", "B", "C", "D", "E"});

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

6. Add an array element to a separate string (Joins the elements of the provided array into a single string)

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1. Containing the provided list of elements
2. Apache Common Lang
3. String j = stringutils.join (new string[] { "a", "B", "C"}, ",");
4. System.out.println (j);
5. A, B, c

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

7. Converting an array list into an array (Covnert a ArrayList to an array)

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1. String[] Stringarray = { "a", "B", "C", "D", "E"};
2. arraylist<string> ArrayList = new Arraylist<string> (Arrays.aslist (Stringarray));
3. string[] Stringarr = new String[arraylist.size ()];
4. Arraylist.toarray (Stringarr);
5. for (String S:stringarr)
6. System.out.println (s);

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);

8. Convert an array into a collection (convert an array to a set)

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

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

9. Inverse Array (Reverse an array)

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

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

10. Delete the array element (remove element of an array)

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

Int[] Intarray = {1, 2, 3, 4, 5};int[] removed = Arrayutils.removeelement (Intarray, 3);//create a new ARRAYSYSTEM.OUT.PR Intln (arrays.tostring (removed));

One more–convert int to byte array

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1. byte[] bytes = bytebuffer.allocate (4). Putint (8). Array ();
3. For (byte t:bytes) {
4. System.out.format ("0x%x", t);
5. }

Java Array Tips