How to copy an array in java

Source: Internet
Author: User

In JAVA, you can use the copy statement "A = B" to pass values to basic data types. However, if A and B are arrays of the same type, copying is equivalent to passing an array variable reference to another array. If an array changes, the variables that reference the same Array also change.

The following describes how to copy an array in JAVA:
1. Use the FOR loop to copy or copy each element of the array, but the efficiency is poor.
2. Use the clone method to obtain the value of the array, instead of reference. You cannot copy the specified element, which is less flexible.
3. We recommend that you use the System. arraycopy (src, srcPos, dest, destPos, length) method.

1. Use the FOR Loop
Don't talk about it.

2. Use clone
Int [] src = {1, 3, 5, 6, 7, 8 };
Int [] dest;
Dest = (int []) src. clone (); // create with clone
Copy. Note that forced conversion is required for clone.

3. Use System. arraycopy
Int [] src = {1, 3, 5, 6, 7, 8 };
Int [] dest = new int [6];
System. arraycopy (src, 0, dest, 0, 6 );

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