Java Utililty Methods Class Load

List of utility methods to do Class Load

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Description

The list of methods to do Class Load are organized into topic(s).

Method

ClassclassForName(String typeName)
class For Name 
try {
    return Class.forName(typeName);
} catch (ClassNotFoundException e) {
    return null;
ClassclassForName(String typeName)
class For Name 
if (typeName.equals("boolean"))
    return boolean.class;
if (typeName.equals("byte"))
    return byte.class;
if (typeName.equals("char"))
    return char.class;
if (typeName.equals("short"))
    return short.class;
...
ClassclassForNameNoThrow(String className)
class For Name No Throw 
try {
    return Class.forName(className);
} catch (Throwable ex) {
return Object.class;
ClassclassForNameOrNull(final String className)
Call Class.forName(className), but return null if any exception is thrown. 
try {
    return Class.forName(className);
} catch (final Exception e) {
    return null;
ClassclassForNameOrPrimitive(String name, ClassLoader loader)
class For Name Or Primitive 
if (name == null || name.equals("") || name.equals("null") || name.equals("void"))
    return Void.TYPE;
if (name.equals("boolean"))
    return Boolean.TYPE;
if (name.equals("byte"))
    return Byte.TYPE;
if (name.equals("char"))
    return Character.TYPE;
...
ObjectfromString(Class clazz, String stringValue)
from String 
if (String.class == clazz) {
    return stringValue;
} else if (Long.class == clazz) {
    return Long.valueOf(stringValue);
throw new IllegalArgumentException(
        "Instantiating " + clazz + " from string representation is not supported. Most likely an"
                + " incompatible version of google-http-client was used.");
...
TfromString(Class clazz, String name)
from String 
try {
    return Enum.valueOf(clazz, name);
} catch (IllegalArgumentException e) {
    return null;
TfromString(Class clz, String value, T defaultVal)
from String 
assert (clz != null);
if (value != null) {
    try {
        return Enum.valueOf(clz, value.trim());
    } catch (IllegalArgumentException ex) {
        assert (false);
return defaultVal;
TfromString(Class enumClass, String s, T defaultValue)
Returns the enum constant that matches the specified string, or the default value if none of the constants matches or if the string is null. 
try {
    return Enum.valueOf(enumClass, s);
} catch (IllegalArgumentException e) {
    return defaultValue;
} catch (NullPointerException e) {
    return defaultValue;
TfromString(Class enumType, String text)
from String 
if (text != null) {
    for (T value : enumType.getEnumConstants()) {
        if (text.equalsIgnoreCase(value.toString())) {
            return value;
throw new IllegalArgumentException("No constant with text " + text + " found");
...