Formatter (Java Platform SE 7 ) An interpreter for printf-style format strings.
This class provides support for layout justification and alignment, common formats for numeric, string, and date/time data, and locale-specific output. Common Java types such as byte, BigDecimal, and Calendar are supported. Limited formatting customization for arbitrary user types is provided through the Formattable interface. Formatters are not necessarily safe for multithreaded access. Thread safety is optional and is the responsibility of users of methods in this class.
Formatted printing for the Java language is heavily inspired by C's printf. Examples of expected usage: Convenience methods for common formatting requests exist as illustrated by the following invocations: // Writes a formatted string to System.out. Like C's sprintf(3), Strings may be formatted using the static method String.format: Organization This specification is divided into two sections.
Summary Format String Syntax Conversions out.toUpperCase() Date/Time Conversions Flags. Java Generics. It would be nice if we could write a single sort method that could sort the elements in an Integer array, a String array, or an array of any type that supports ordering.
Java Generic methods and generic classes enable programmers to specify, with a single method declaration, a set of related methods, or with a single class declaration, a set of related types, respectively. Generics also provide compile-time type safety that allows programmers to catch invalid types at compile time. Using Java Generic concept, we might write a generic method for sorting an array of objects, then invoke the generic method with Integer arrays, Double arrays, String arrays and so on, to sort the array elements. Generic Methods You can write a single generic method declaration that can be called with arguments of different types. Example Following example illustrates how we can print an array of different type using a single Generic method − This will produce the following result − Output Bounded Type Parameters. Learn Java Programming - Generics: Bounded Type Parameters Tutorial. Java Tutorial. Java is a high-level programming language originally developed by Sun Microsystems and released in 1995.
Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. This tutorial gives a complete understanding of Java. This reference will take you through simple and practical approach while learning Java Programming language. This reference has been prepared for the beginners to help them understand the basic to advanced concepts related to Java Programming language. Before you start doing practice with various types of examples given in this reference, I'm making an assumption that you are already aware about what is a computer program and what is a computer programming language?
For most of the examples given in this tutorial you will find Try it option, so just make use of this option to execute your Java programs at the spot and enjoy your learning. Java #E3: Creating a GUI with Eclipse. Understanding toString() method. If you want to represent any object as a string, toString() method comes into existence.
The toString() method returns the string representation of the object. If you print any object, java compiler internally invokes the toString() method on the object. So overriding the toString() method, returns the desired output, it can be the state of an object etc. depends on your implementation. Advantage of Java toString() method By overriding the toString() method of the Object class, we can return values of the object, so we don't need to write much code.
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