OnJava8-Examples/onjava/ConvertTo.java

// onjava/ConvertTo.java
// (c)2021 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
package onjava;

public interface ConvertTo {
  static boolean[] primitive(Boolean[] in) {
    boolean[] result = new boolean[in.length];
    for(int i = 0; i < in.length; i++)
      result[i] = in[i]; // Autounboxing
    return result;
  }
  static char[] primitive(Character[] in) {
    char[] result = new char[in.length];
    for(int i = 0; i < in.length; i++)
      result[i] = in[i];
    return result;
  }
  static byte[] primitive(Byte[] in) {
    byte[] result = new byte[in.length];
    for(int i = 0; i < in.length; i++)
      result[i] = in[i];
    return result;
  }
  static short[] primitive(Short[] in) {
    short[] result = new short[in.length];
    for(int i = 0; i < in.length; i++)
      result[i] = in[i];
    return result;
  }
  static int[] primitive(Integer[] in) {
    int[] result = new int[in.length];
    for(int i = 0; i < in.length; i++)
      result[i] = in[i];
    return result;
  }
  static long[] primitive(Long[] in) {
    long[] result = new long[in.length];
    for(int i = 0; i < in.length; i++)
      result[i] = in[i];
    return result;
  }
  static float[] primitive(Float[] in) {
    float[] result = new float[in.length];
    for(int i = 0; i < in.length; i++)
      result[i] = in[i];
    return result;
  }
  static double[] primitive(Double[] in) {
    double[] result = new double[in.length];
    for(int i = 0; i < in.length; i++)
      result[i] = in[i];
    return result;
  }
  // Convert from primitive array to wrapped array:
  static Boolean[] boxed(boolean[] in) {
    Boolean[] result = new Boolean[in.length];
    for(int i = 0; i < in.length; i++)
      result[i] = in[i]; // Autoboxing
    return result;
  }
  static Character[] boxed(char[] in) {
    Character[] result = new Character[in.length];
    for(int i = 0; i < in.length; i++)
      result[i] = in[i];
    return result;
  }
  static Byte[] boxed(byte[] in) {
    Byte[] result = new Byte[in.length];
    for(int i = 0; i < in.length; i++)
      result[i] = in[i];
    return result;
  }
  static Short[] boxed(short[] in) {
    Short[] result = new Short[in.length];
    for(int i = 0; i < in.length; i++)
      result[i] = in[i];
    return result;
  }
  static Integer[] boxed(int[] in) {
    Integer[] result = new Integer[in.length];
    for(int i = 0; i < in.length; i++)
      result[i] = in[i];
    return result;
  }
  static Long[] boxed(long[] in) {
    Long[] result = new Long[in.length];
    for(int i = 0; i < in.length; i++)
      result[i] = in[i];
    return result;
  }
  static Float[] boxed(float[] in) {
    Float[] result = new Float[in.length];
    for(int i = 0; i < in.length; i++)
      result[i] = in[i];
    return result;
  }
  static Double[] boxed(double[] in) {
    Double[] result = new Double[in.length];
    for(int i = 0; i < in.length; i++)
      result[i] = in[i];
    return result;
  }
}