Java Utililty Methods Boolean From

s = s.toLowerCase();
if (s.equals("yes") || s.equals("y") || s.equals("true") || s.equals("t") || s.equals("1"))
    return Boolean.TRUE;
if (s.equals("no") || s.equals("n") || s.equals("false") || s.equals("f") || s.equals("0"))
    return Boolean.FALSE;
return null;

return str != null && str.equalsIgnoreCase("true");

if (isTrue(str))
    return true;
if (isFalse(str))
    return false;
return null;

try {
    return Boolean.parseBoolean(str);
} catch (Throwable e) {
    return null;

Converts a String to a boolean (optimised for performance).

if (str == "true") {
    return true;
if (str == null) {
    return false;
switch (str.length()) {
case 2: {
...

return new Boolean(string).booleanValue();

if (string.equals("false") || string.equals("no"))
    return false;
else if (string.equals("true") || string.equals("yes"))
    return true;
else
    throw new IllegalArgumentException("Invalid boolean specifier: \"" + string + "\"");

if (isEmpty(string)) {
    return defaultValue;
try {
    return Boolean.parseBoolean(string);
} catch (NumberFormatException ex) {
    return defaultValue;

if (text == null) {
    return null;
} else if ("true".equals(text)) {
    return Boolean.TRUE;
} else if ("false".equals(text)) {
    return Boolean.FALSE;
} else {
    throw new IllegalArgumentException("Cannot parse '" + text + "' into JSON boolean");
...

return val != null && (val.equals("1") || val.equalsIgnoreCase("Y") || val.equalsIgnoreCase("T")
        || val.equalsIgnoreCase("YES") || val.equalsIgnoreCase("TRUE"));