Language Basics

Language Basics Code Samples

Learn basic language constructs to start writing applications with the Java programming language.

• Arrays
• Control Flow
• Date and Time
• Operators
• Packages
• Variables

Arrays

• ArrayDemo.java creates an array, puts some values in it, and displays the values. For supporting information see The Java Tutorial: Object Basics and Simple Data Objects.

• ArrayCopyDemo.java uses the arrayCopy method to copy some elements from one array to another. For supporting information see The Java Tutorial: Object Basics and Simple Data Objects.

• ArrayofArraysDemo.java creates an array and uses an initializer to populate it with four subarrays. For supporting information see The Java Tutorial: Object Basics and Simple Data Objects.

• ArrayofArraysDemo2.java creates an array of arrays by explicitly writing code to create each subarray. For supporting information see The Java Tutorial: Object Basics and Simple Data Objects.

• ArrayofStringsDemo.java uses an array initializer to create an array containing three string objects and puts the strings in all lowercase letters. For supporting information see The Java Tutorial: Object Basics and Simple Data Objects.

Control Flow

• BreakDemo.java contains a for loop that searches for a particular value within an array. For supporting information see The Java Tutorial: Nuts and Bolts.

*BreakWithLabelDemo.java searches for a value in a two-dimensional array. For supporting information see The Java Tutorial: Nuts and Bolts.

• ContinueDemo.java steps through a string buffer and checks each letter. For supporting information see The Java Tutorial: Nuts and Bolts.

• ContinueWithLabelDemo.java uses nested loops to search for a substring within another string. For supporting information see The Java Tutorial: Nuts and Bolts.

• DoWhileDemo.java shows how to use a do-while statement to continually execute a block of code while a condition remains true. For supporting information see The Java Tutorial: Nuts and Bolts.

• ForDemo.java uses a for statement to iterate over the elements of an array and print them. For supporting information see The Java Tutorial: Nuts and Bolts.

• IfElseDemo.java uses an if-else statement to assign a grade based on the value of a test score. For supporting information see The Java Tutorial: Nuts and Bolts.

• SwitchDemo.java uses the switch statement to conditionally perform statements based on an integer expression. For supporting information see The Java Tutorial: Nuts and Bolts.

• SwitchDemo2.java illustrates how it can be useful to make a case statement terminate the flow of control. For supporting information see The Java Tutorial: Nuts and Bolts.

• WhileDemo.java shows how to use a while statement to continually execute a block of code while a condition remains true. For supporting information see The Java Tutorial: Nuts and Bolts.

Date & Time

• June.java demonstrates the limits of scope by finding out which month of the year is June. For supporting information see New to Java Programming Supplement, Feb 2002.

• TimeTest.java shows you how to create a time stamp object that returns the current time. For supporting information see New to Java Programming Supplement, November 2001.

Operators

• ArithmeticDemo.java shows you how to perform mathematical operations with numbers. For supporting information see The Java Tutorial: Nuts and Bolts.

Packages

• TestFileClass.java New to Java Programming Supplement, Feb 2002.

Variables

• Cast.java uses the instanceOf method to determine the type of objects in a list and shows how to cast the objects to their correct type before accessing the data. For supporting information see New to Java Programming Supplement, March 2002.