How to assign values ​​to arrays in java

1. In array operations, you can use equal (=) assignment

Note: At this time, the new array only points to the storage space of the original array, and does not Reapply for new space.

Example:

public class ArrayTest{
	public static void main(String args[]){
		// 1
		int[] a=new int[4];
		a[0]=1;
		a[1]=2;
		a[2]=3;
		a[3]=4;
		System.out.println(a[3]);
		// 2
		int b[]=new int[4];
		b[0]=1;
		b[1]=2;
		b[2]=3;
		b[3]=4;
		System.out.println(b[2]);
		// 3
		int[] c={1,2,3,4};
		int[] d=new int[]{1,2,3,4};
		System.out.println(c[2]);
		System.out.println(d[3]);
	}
}

2. Use System.ararycopy method

System.arraycopy(originalArray, 0, targetArray, 0, originalArray.length);

Note: The new array re-applies for storage address space, and then transfers it to the original array The data is copied over.

Recommended tutorial: Java tutorial

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