Difference between revisions of "Compiling and Launching"
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== javac == | == javac == | ||
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* the directories for the package structure will however be automatically created by javac. | * the directories for the package structure will however be automatically created by javac. | ||
| − | * Options: | + | There are four things to keep in mind while compiling: |
| − | * - | + | |
| − | * | + | * Which are the files that need to be compiled ? |
| − | * | + | * The directory where javac looks for other .java source files that are used by the file to be compiled. |
| + | * The directory where javac looks for class files that are used by the file to be compiled. | ||
| + | * The directory to place the generated class files in. | ||
| + | |||
| + | Options: | ||
| + | |||
| + | * the -sourcepath is the directory where the compiler looks for other java files. | ||
| + | * It has to be the directory that contains the hierarchy of the package structure of the source files. | ||
| + | |||
| + | for e.g. if we are compiling ClassB.java in directory src/net/suhrid/pkgB/ClassB.java which uses ClassA located in net/suhrid/pkgA/pkgA/ClassA.java then argument to sourcepath must be the "src" directory: | ||
| + | javac -sourcepath src net/suhrid/pkgB/ClassB.java | ||
| + | |||
| + | * -classpath and -cp can be either of the arguments to instruct the compiler to look for classes used by the compiled file. | ||
| + | * In case of directories, the directory which contains the hierarchy of the package structure of the class files. (similar to sourcepath) | ||
| + | * In case of jar files, the argument is the location of the jar file - including the file name (which contains the package structure of the class files.) | ||
[[Category:OCPJP]] | [[Category:OCPJP]] | ||
Revision as of 04:41, 16 June 2011
javac
- javac by default places the generated class files in the same directory as the source files.
- use the javac -d option to place the class files in some other directory.
- if the directory does not exist, there will be an error.
- the directories for the package structure will however be automatically created by javac.
There are four things to keep in mind while compiling:
- Which are the files that need to be compiled ?
- The directory where javac looks for other .java source files that are used by the file to be compiled.
- The directory where javac looks for class files that are used by the file to be compiled.
- The directory to place the generated class files in.
Options:
- the -sourcepath is the directory where the compiler looks for other java files.
- It has to be the directory that contains the hierarchy of the package structure of the source files.
for e.g. if we are compiling ClassB.java in directory src/net/suhrid/pkgB/ClassB.java which uses ClassA located in net/suhrid/pkgA/pkgA/ClassA.java then argument to sourcepath must be the "src" directory: javac -sourcepath src net/suhrid/pkgB/ClassB.java
- -classpath and -cp can be either of the arguments to instruct the compiler to look for classes used by the compiled file.
- In case of directories, the directory which contains the hierarchy of the package structure of the class files. (similar to sourcepath)
- In case of jar files, the argument is the location of the jar file - including the file name (which contains the package structure of the class files.)
