Generic method to copy array - Android java.lang

Android examples for java.lang:Array Element

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Description

Generic method to copy array

Demo Code


//package com.java2s;
import java.lang.reflect.Array;

public class Main {
    public static <T> T[] copyOf(T[] original, int newLength) {
        if (original == null) {
            throw new NullPointerException();
        }// w  ww .j a v  a 2 s.c  om
        if (newLength < 0) {
            throw new NegativeArraySizeException();
        }
        return copyOfRange(original, 0, newLength);
    }

    public static <T> T[] copyOfRange(T[] original, int start, int end) {
        int originalLength = original.length; // For exception priority
                                              // compatibility.
        if (start > end) {
            throw new IllegalArgumentException();
        }
        if (start < 0 || start > originalLength) {
            throw new ArrayIndexOutOfBoundsException();
        }
        int resultLength = end - start;
        int copyLength = Math.min(resultLength, originalLength - start);
        T[] result = (T[]) Array.newInstance(original.getClass()
                .getComponentType(), resultLength);
        System.arraycopy(original, start, result, 0, copyLength);
        return result;
    }
}

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