Java. One-dimensional array, Java. Dimension Array

Java. One-dimensional array, Java. Dimension Array

One-Bit Array initialization (two methods)

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

Array type array name [] = new data type [constant value] // This method will assign the same default value to all array elements, for the value type, the default value is also 0

 

1. array Traversal

In addition to the for loop, it is relatively simple to use the for-each statement. Format: for (type variable name: array) type: Any data type; array: defined array name

{Statement}

public class bianli {    public static void 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 running

Ps: Method of direct Traversal

Arrays. asList (a) // a is the target array to be traversed.

 

Import java. util. *; public class asList {public static void 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 ());}}

 

 

2: copying Arrays

System. arraycopy (a, B, c, d, e) // a: source array B: Where to start copying c: target array d: Offset e: number of elements to be copied from the source array to the target array

public class arraycopy {   public static void main(String[] args){       String A[]={"H","e","1","1","0"};       String B[]=new String[6];       System.arraycopy(A, 0, B, 1, B.length-1);       for(int i=0;i<B.length;i++){       System.out.print(B[i]+" ");       }       }}

Results After running

3: Fill

Arrays. Fill (a, B) // a: target array name B: value to be filled

import java.util.*;public class tianchong {    public static void main(String[] args) {        // TODO Auto-generated method stub     String[] A=new String[3];     Arrays.fill(A, "I love you");     for(int i=0;i<A.length;i++){         System.out.println(A[i]+" ");     }    }}

After running:

4: equal

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

Import java. util. arrays; public class xiangdeng {public static void 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 ("array A and B are equal:" + Arrays. equals (A, B); System. out. println ("array A and c are equal:" + Arrays. equals (A, C ));}}

After running: