Java Utililty Methods Primitive Type Create

List of utility methods to do Primitive Type Create

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Description

The list of methods to do Primitive Type Create are organized into topic(s).

Method

ObjecttoPrimitiveArray(Object[] array)
Convert an array of objects to an array of primitive types. 
if (array instanceof Integer[]) {
    int[] r = new int[array.length];
    int i;
    int k = array.length;
    for (i = 0; i < k; i++)
        r[i] = (((Integer) array[i]) == null) ? 0 : ((Integer) array[i]).intValue();
    return r;
if (array instanceof Boolean[]) {
    boolean[] r = new boolean[array.length];
    int i;
    int k = array.length;
    for (i = 0; i < k; i++)
        r[i] = (((Boolean) array[i]) == null) ? false : ((Boolean) array[i]).booleanValue();
    return r;
if (array instanceof Byte[]) {
    byte[] r = new byte[array.length];
    int i;
    int k = array.length;
    for (i = 0; i < k; i++)
        r[i] = (((Byte) array[i]) == null) ? 0 : ((Byte) array[i]).byteValue();
    return r;
if (array instanceof Character[]) {
    char[] r = new char[array.length];
    int i;
    int k = array.length;
    for (i = 0; i < k; i++)
        r[i] = (((Character) array[i]) == null) ? 0 : ((Character) array[i]).charValue();
    return r;
if (array instanceof Double[]) {
    double[] r = new double[array.length];
    int i;
    int k = array.length;
    for (i = 0; i < k; i++)
        r[i] = (((Double) array[i]) == null) ? 0 : ((Double) array[i]).doubleValue();
    return r;
if (array instanceof Float[]) {
    float[] r = new float[array.length];
    int i;
    int k = array.length;
    for (i = 0; i < k; i++)
        r[i] = (((Float) array[i]) == null) ? 0 : ((Float) array[i]).floatValue();
    return r;
if (array instanceof Long[]) {
    long[] r = new long[array.length];
    int i;
    int k = array.length;
    for (i = 0; i < k; i++)
        r[i] = (((Long) array[i]) == null) ? 0 : ((Long) array[i]).longValue();
    return r;
if (array instanceof Short[]) {
    short[] r = new short[array.length];
    int i;
    int k = array.length;
    for (i = 0; i < k; i++)
        r[i] = (((Short) array[i]) == null) ? 0 : ((Short) array[i]).shortValue();
    return r;
throw new IllegalArgumentException();
ClasstoPrimitiveArrayType(Class c)
to Primitive Array Type 
if (!c.isPrimitive())
    throw new RuntimeException(c + " is not a primitive type");
if (c == int.class)
    return int[].class;
if (c == long.class)
    return long[].class;
if (c == double.class)
    return double[].class;
...
booleantoPrimitiveBoolean(Object o)
to Primitive Boolean 
Boolean b = toBoolean(o);
if (b != null) {
    return b.booleanValue();
return false;
booleantoPrimitiveBoolean(Object o)
to Primitive Boolean 
Boolean b = toBoolean(o);
if (b != null) {
    return b.booleanValue();
return false;
byte[]toPrimitiveByteArray(Integer[] array)
to Primitive Byte Array 
byte[] destination = new byte[array.length];
for (int i = 0; i < array.length; i++)
    destination[i] = array[i].byteValue();
return destination;
ClasstoPrimitiveClass(Class wrapperClass)
to Primitive Class 
if (wrapperClass == Integer.class) {
    return Integer.TYPE;
} else if (wrapperClass == Byte.class) {
    return Byte.TYPE;
} else if (wrapperClass == Short.class) {
    return Short.TYPE;
} else if (wrapperClass == Long.class) {
    return Long.TYPE;
...
doubletoPrimitiveDouble(Double d)
<#if locale="en">

Convert to Double to double.If the Double value is null, return 0d. 

if (d == null) {
    return 0d;
return d.doubleValue();
inttoPrimitiveInt(Integer value)
Converts an object Integer to a primitive int. 
if (value == null) {
    return 0;
return value;
inttoPrimitiveInt(Object o)
Converts the object into primitive int. 
return toPrimitiveBoolean(o) ? 1 : 0;
NumbertoPrimitiveNumber(String s)
Converts a string into its "closest" primitive type. 
if (s == null) {
    return null;
s = s.trim();
try {
    int i = Integer.parseInt(s);
    return i;
} catch (NumberFormatException nfe) {
...