COP%203330

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COP 3330

• Notes 1/12

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Today's topics

• Downloading Java and Eclipse
• Hello World
• Basic control structures
• Basic I/O
• Strings

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Downloading Java
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Downloading Java
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Downloading Java
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Downloading Eclipse
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Downloading Eclipse
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Creating a Java Program With Eclipse
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Creating a Java Program With Eclipse
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Creating a Java Program With Eclipse
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Creating a Java Program With Eclipse
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Creating a Java Program With Eclipse
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Running a Java Program With Eclipse
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Running a Java Program With Eclipse

• Double-click Java Application

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Running a Java Program With Eclipse
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Running a Java Program Using Command Line
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Running a Java Program Using Command Line
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Running a Java Program Using Command Line
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Running a Java Program Using Command Line

• Add the path of the bin directory of your JDK
  install to your path environment variable
• In my case
• C\Program Files\Java\jdk1.5.0_04\bin

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Running a Java Program Using Command Line
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Running a Java Program Using Command Line
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Running a Java Program Using Command Line

• If you get the error
• Exception in thread "main" java.lang.NoClassDefFou
  ndError HelloWorldApp
• Make sure youre in the same directory as your
  .java file and that you typed everything
  correctly
• If you still get the error, type at the command
  line set CLASSPATH

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Java Virtual Machine

• Java is compiled to Java bytecode, not machine
  language
• Java bytecode is similar to machine code except
  that it is meant for the Java Virtual Machine
  (JVM)
• The JVM is an interpreter of Java bytecode (i.e.
  it runs Java programs)

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Java Virtual Machine

• Machine language must be specific to a processor,
  so programs written in most languages must be
  recompiled to run on different processors
• The same compiled Java program can run on any
  computer that can run the correct version of the
  JVM