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Methods of Java

Methods In Java

Java program consists of one or more classes, and a class may contain methods. In this blog, we will learn about Java and their methods. Methods are known as functions in C and Cpp programming languages. A method has a name and return type. The main method is a must in a Java program as execution begins from it.

Syntax of methods:
"Access specifier" "Keyword(s)" "return type" methodName(List of arguments)
// Body of method

Access specifier can be public or private which decides whether other classes can call a method.
Keywords such as static or synchronized are used for some particular methods.
Return type indicates return value which method returns.
Method name is a valid Java identifier name.

Access specifier, keyword(s), and arguments are optional.

Examples of methods declaration:
public static void main(String[] args);
void myMethod();
private int maximum();
public synchronized int search(java.lang.Object);

Java Method example:

class Methods

  // Constructor method

    System.out.println("Constructor method is called when an object of it's class is created");

  // Main method where program execution begins

  public static void main(String[] args)
    Methods object = new Methods();

  // Static method

  static void staticMethod()
    System.out.println("Static method can be called without creating object");

  // Non static method

  void nonStaticMethod()
    System.out.println("Non static method must be called by creating an object");

Java methods list

Java has a built-in library of many useful classes, and there are thousands of methods which can be used in a program. Just call a method and get your work done :). You can find the list of methods in a class by typing following command on command prompt:

javap package.classname

For example
javap java.lang.String // list all methods and constants of String class.
javap java.math.BigInteger // list constants and methods of BigInteger class in java.math package

Java String methods
String class contains methods which are useful for performing operations on String(s). Below program illustrate how to use inbuilt methods of String class.

Java string class program
class StringMethods
  public static void main(String args[])
    int n;
    String s = "Java programming", t = "", u = "";


    // Find length of string

    n = s.length();
    System.out.println("Number of characters = " + n);

    // Replace characters in string

    t = s.replace("Java", "C++");

    // Concat string with another string

    u = s.concat(" is fun");

This post first appeared on Android Technology, please read the originial post: here

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Methods of Java


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