Java. One-dimensional arrays

Initialization of an array (two methods)

Array type array []={value 1, value 2, value 3 ... Value n};

Array type array name []=new data type [constant value]//This method assigns the same default value to all array elements, and the default value is 0 for numeric types

1. Iterating the array

In addition to the For loop, the simpler is the For-each statement; format: for (type variable name: array) Type: any data type; array: defined array name

                                                                                      {statement}

 Public class Bianli {    publicstaticvoid  main (string[] args) {        // TODO auto-generated Method stub           int a[]={1,2,3,4,5,6,7};     for int i:a) {       System.out.print (i);}}    }

Results after the run

Ps: Method of direct traversal

Arrays.aslist (a)//a is the target array to traverse

import java.util.*;  Public class aslist {    publicstaticvoid  main (string[] args) {        //  TODO auto-generated method stub  string[] a={"I", "L", "O", "V", "E", "J", "a", "V", "a"};  System.out.println ("Array A:" +Arrays.aslist (a));}    }

2: Copying of arrays

System.arraycopy (a,b,c,d,e)//a: source array B: from where to start copying C: Destination array D: Offset E: The number of elements to copy from the source array to the destination array

 Public class arraycopy {   publicstaticvoid  main (string[] args) {       String a[]= {"H", "E", "1", "1", "0"};       String b[]=new string[6];        0, B, 1, b.length-1);         for (int i=0;i<b.length;i++) {       System.out.print (B[i]+ "");        }}}

Results after the run

3: Fill

Arrays.fill (b)//A: Target array name B: The value to be populated

import java.util.*;  Public class Tianchong {    publicstaticvoid  main (string[] args) {        //  TODO auto-generated method stub     string[] a=new string[3];     " I Love You ");       for (int i=0;i<a.length;i++) {         System.out.println (A[i]+ "");     }}}

After running:

4: Equal

Arrays.equals (b)//target array A and target array B

Import java.util.Arrays;  Public class Xiangdeng {    publicstaticvoid  main (string[] args) {        //  TODO auto-generated method stub        string[] a={"A", "B", "C"};        String[] B={"A", "B", "C"};        String[] C={"A", "B", "C"};        System.out.println ("Arrays A and B are equal:" +arrays.equals (A, b));        System.out.println ("Arrays A and C are equal:" +arrays.equals (A, c));}    }

After running:

Java. One-dimensional array