Java

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Utility Methods ​

Parse methods ​

MethodsDescription
static int parseInt(String s)Converts String s to an int using radix 10.
static byte parseByte(String s)Converts String s to a byte.
static short parseShort(String s)Converts String s to a short.
static long parseLong(String s)Converts String s to a long.
static float parseFloat(String s)Converts String s to a float.
static double parseDouble(String s)Converts String s to a double.

valueOf methods ​

MethodsDescription
static Integer valueOf(String s)Converts String s to an Integer object.
static Byte valueOf(String s)Converts String s to a Byte pbject.
static Short valueOf(String s)Converts String s to a Short object.
static Long valueOf(String s)Converts String s to a Long object.
static Float valueOf(String s)Converts String s to a Float object.
static Double valueOf(String s)Converts String s to a Double object.

toString methods ​

MethodsDescription
static String toString(int n)Converts int n to a String object.
static String toString(byte n)Converts byte n to a String object.
static String toString(short n)Converts short n to a String object.
static String toString(long n)Converts long n to a String object.
static String toString(float n)Converts float n to a String object.
static String toString(double n)Converts double n to a String object.

String toString()

Converts an invoking object to String.

Methods of Character Class ​

MethodsDescription
static boolean isDigit(char ch)Returns true if ch is a digit between 0-9 otherwise false.
static boolean isLetter(char ch)Returns true if ch is letter otherwise returns a false.
static boolean isLetterOrDigit(char ch)Returns true if ch is a letter or a digit otherwise returns a false.
static boolean isLowerCase(char ch)Returns true if ch is a lowercase otherwise returns a false.
static boolean isUpperCase(char ch)Returns true if ch is a uppercase otherwise returns a false.
static boolean isWhitespace(char ch)Returns true if ch is a whitespace otherwise returns a false.
static char toLowerCase(char ch)Returns a lowercase equivalent of ch.
static char toUpperCase(char ch)Returns a uppercase equivalent of ch.