Array copy method : System Class « Development « Java Tutorial

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Java Tutorial » Development » System Class

6. 1. 6. Array copy method

Copy the content of an array (source) to another array (destination), beginning at the specified position, to the specified position of the destination array.


public static void arraycopy (Object source, int sourcePos, Object destination, int destPos, int length)

For example, the following code uses arraycopy to copy the contents of array1 to array2.


public class MainClass {



  public static void main(String[] a) {

    int[] array1 = { 1, 2, 3, 4 };

    int[] array2 = new int[array1.length];

    System.arraycopy(array1, 0, array2, 0, array1.length);



    for(int i: array2){

      

      System.out.println(i);

    }

  }

}

6. 1. System Class
	6. 1. 1.	java.lang.System
	6. 1. 2.	PrintStream has many print method overloads that accept different types
	6. 1. 3.	println adds a line terminator at the end of the argument
	6. 1. 4.	The err field represents a PrintStream object
	6. 1. 5.	The 'in' field represents the standard input stream
	6. 1. 6.	Array copy method
	6. 1. 7.	Terminates the running program and the current JVM
	6. 1. 8.	Returns the computer time in milliseconds
	6. 1. 9.	public static long nanoTime(): provide more precision, i.e. in nanoseconds
	6. 1. 10.	Using System.getProperty(String key) to retrieve system properties
	6. 1. 11.	Create a user-defined property or change the value of the current property
	6. 1. 12.	Returns a default value if the specified property does not exist
	6. 1. 13.	Returns all system properties
	6. 1. 14.	Redirect the output of System.out to a file.

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