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Problem Description:
How to compile a java file?
Solution:
Following example demonstrates how to compile a java file using javac command.
c:\jdk\demoapp> javac First.java
Result:
The above code sample will produce the following result.
First.java compile successfully.
Problem Description:
How to set multiple classpath?
Solution:
Following example demonstrates how to set multiple classpath. Multiple class paths are
separated by a semicolon.
c:> java -classpath C:\java\MyClasse1;C:\java\MyClass2
utility.testapp.main
Result:
The above code sample will produce the following result.
Class path set.
Problem Description:
How to set destination of the class file?
Solution:
Following example demonstrates how to debug a java file using =g option with javac command.
c:> javac demo.java -g
Result:
The above code sample will produce the following result.
Demo.java will debug.
Problem Description:
How to set classpath?
Solution:
Following example demonstrates how to set classpath.
C:> java -classpath C:\java\DemoClasses utility.demoapp.main
Result:
The above code sample will produce the following result.
Class path set.
Problem Description:
How to view current classpath?
Solution:
Following example demonstrates how to view current classpath using echo command.
C:> echo %CLASSPATH%
Result:
The above code sample will produce the following result.
.;C:\Program Files\Java\jre1.6.0_03\lib\ext\QTJava.zip
Problem Description:
How to set destination of the class file?
Solution:
Following example demonstrates how to set destination of the class file that will be created after
compiling a java file using -d option with javac command.
c:> javac demo.java -d c:\myclasses
Result:
The above code sample will produce the following result.
Demo application executed.
Problem Description:
How to run a class file?
Solution:
Following example demonstrates how to run a class file from command prompt using java
command.
c:\jdk\demoapp>java First
Result:
The above code sample will produce the following result.
Demo application executed.
Problem Description:
How to check version of java running on your system?
Solution:
Following example demonstrates how to check version of java installed on your system using
version argument with java command.
java -version
Result:
The above code sample will produce the following result.
java version "1.6.0_13"
Java(TM) SE Runtime Environment (build 1.6.0_13-b03)
Java HotSpot(TM) Client VM (build 11.3-b02, mixed mode, sharing)
Problem Description:
How to set classpath when class files are in .jar file?
Solution:
Following example demonstrates how to set class path when classes are stored in a .jar or .zip
file.
c:> java -classpath C:\java\myclasses.jar utility.testapp.main
Result:
The above code sample will produce the following result.
Class path set.