Java.One-dimensional array

Initialization of one-bit array (two methods)

array type array name[]={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 numerical types, the default value is also 0

1. Array traversal

Except for the for loop, it is relatively simple Is a 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);
   }
    }

}

The result after running

Ps : Direct traversal method

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("数组A："+Arrays.asList(A));
    }
}

2: Array copy

System.arraycopy(a,b,c,d,e) / /a: Source array b: From which position to copy c: Target array d: Offset e: The 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]+" ");
       }
       }
}

The result after running

3: Filling

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("数组A和B相等："+Arrays.equals(A, B));
        System.out.println("数组A和c相等："+Arrays.equals(A, C));
    }

}

After running: