Java tutorials & examples

Here is a basic hello world java program. Run the following to compile and run it. $ javac HelloWorld.java $ java HelloWorld

System.out.println example println will append a new line after the string. System.out.print example print will not append a new line after the string.

System.out.format method format multiple arguments based on format string. Basic example print integer 8 characters in width print float with 2 digits after decimal point

Static variables are created once for a class and shared by all instances. Static variable is created the moment class is loaded. static variable example read more

Using this to access a field In case a field is shadowed by method or constructor parameter, the field can be accessed using this keyword. read more

Initialize string array using curly braces {}

Java String startsWith(String prefix) example: To specify offset use startsWith(String prefix, int toffset)

Case sensitive comparison Compare strings using firstString.compareTo(secondString). Positive outcome means firstString > secondString and so on. Case insensitive comparison – compareToIgnoreCase

Initialize arrat and print length Access element at specific index Access non existing index This will throw Index Out Of Bounds Exception

Java – two dimentional array example

Fill all values in an array Fill range in an array

String method equals check if both references points objects with same values stored in them. Operator == check if both references points to same object.

Print exception stack trace Print exception short description