Array manipulation in Java

Objective

In Java, there are many well-packaged classes that can be used to manipulate arrays (sorting, copying, and so on), making arrays very convenient to use. This is the benefit of a high-level language.

code example-one-dimensional array

 Packagetest;Importjava.util.Arrays; Public classTest { Public Static voidMain (string[] args) {int[]a = {1, 3, 5, 2, 4, 6}; //convert an array to a string outputSystem.out.println (Arrays.tostring (a));/*//Sort the array after output arrays.sort (a);                System.out.println (Arrays.tostring (a));        Finds the subscript System.out.println of an element in an array (Arrays.binarysearch (A, 1));                System.out.println (Arrays.binarysearch (A, 5));        Copy an array of int []b = arrays.copyof (A, a.length);                System.out.println (arrays.tostring (b));        Sets all array elements to a value of Arrays.fill (b, 9);                System.out.println (arrays.tostring (b));        Compare two arrays of System.out.println (Arrays.equals (A, b));        Arrays.fill (A, 9); System.out.println (Arrays.equals (A, b));*/        }}

code example-two-dimensional array

1  Packagetest;2 3 Importjava.util.Arrays;4 5  Public classTest {6 7      Public Static voidMain (string[] args) {8         9         //statically createdTen         int[][]a = { One{1, 3, 5, 2, 4, 6}, A{2, 4, 6, 1, 3, 5} -                 }; -          the         //dynamically created -         introw = 2; -         intCol = 6; -         int[][]B =New int[Row][col]; +          -         //convert an array to a string output + System.out.println (Arrays.deeptostring (a)); A System.out.println (arrays.deeptostring (b)); at  -         } -}

Run results

Slightly.

Summary

1. Be aware of the dynamic creation of the above two-dimensional array. The meaning of this code differs from that in C + +-C + + can only create a one-dimensional pointer array dynamically, and then a new one-dimensional array on the pointer element of each pointer array. Here is the direct new out of the two-dimensional array.

2. There are many convenient APIs that are not listed in detail, so consult the Java API manual when using it.

Array manipulation in Java