public class Test1 {

	public static void main(String[] args) {

		int[] arr1 = {0, 1, 2, 3, 4, 5, 6};

		int[] arr2 = new int[7];

		// for循环

		for ( int i = 0; i < arr1.length; i++ ) {

			arr2[i] = arr1[i];

		}

		for ( int i = 0; i <arr2.length; i++ ) {

			System.out.print(arr2[i]); // 0123456

		}

		System.out.println();

		//clone方法复制数组

		int[] arr3 = new int[7];

		arr3 = arr1.clone();

		for ( int i = 0; i < arr3.length;  i++ ) {

			System.out.print(arr3[i]); // 0123456

		}

		System.out.println();

		// System.arraycopy方法

		int[] arr4 = new int[7];

		System.arraycopy(arr1, 0, arr4, 1, 3);

		for ( int i = 0; i < arr4.length;  i++ ) {

			System.out.print(arr4[i]); // 0012000

		}

		System.out.println();

		// Arrays.copyOf方法

		int[] arr5 = Arrays.copyOf(arr1, 2);

		for ( int i = 0; i < arr5.length;  i++ ) {

			System.out.print(arr5[i]); // 01

		}

	}

}

public static native void arraycopy(Object src,int srcPos, Object dest, int destPos,int length);

public static <T,U> T[] copyOf(U[] original, int newLength, Class<? extends T[]> newType) {

   @SuppressWarnings("unchecked")

   T[] copy = ((Object)newType == (Object)Object[].class)?(T[]) new Object[newLength]:(T[])

   Array.newInstance(newType.getComponentType(), newLength);System.arraycopy(original,0, copy,0,

   Math.min(original.length, newLength));

   return copy;

}