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Using the Java Library API
Chapter 6 Using the Java Library API
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Java API Library API – Application Program Interface
When you install Java, you get hundreds of pre-build classes – the Java Library Just a giant pile of classes just waiting for you to use You assemble your own program out of largely pre-built code The library is full of code you don’t even have to type – just USE IT!!!
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Example Import javax.swing.JOptionPane; Public class HelloWorld { public static void main (String[] args) JOptionPane.showMessageDialog(null, “Hello); } } // JOptionPane & showMessage are methods
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How to discover the java library
Use the web All of documentation on-line Google java API Click on the library Packages need to be imported Ex: import javax.swing.JOptionPane Must import the package Page of head-first book
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