I am compiling my code through Windows 7 using command prompt -- here are details : I set the class path like this : set classpath= %classpath%;C:\java-programes. You can then compile the source. I found that if I my remote command set.
Using javac and java command with package structures. Here we are going to learn how to compile java classes and launch them when they are defined in some classes using javac and java commands.
Suppose we have two java files. Navigate to package. One directory and compile as follows. So Simple, nice and clean now we need to compile Child. Should we follow the same procedure as above? Navigate to package. Two directory and run javac as follows.
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- Using javac and java commands to compile and launch java programs.
Are we using the command properly? Let us try compiling again, now using the package structure for the Child class. Navigate to sources directory and run. C: \sources> javac package.
Two/Child. java. 1C: \sources> javacpackage. Two/Child. java. Now it compiles successfully and generates class file for the same. Now we have to run Child class. It extends Parent class so it needs to know where exactly Parent class is located. It is in the sources directory. Note that even though it looks like Parent class is located in package.
Two directory, its actually the package name which is represented by a folder. Actually a class is identified by its fully qualified name which is made up of its package name and class name. So the actual name of class Parent is package. One. Parent and the name of Child class is package. Two. Child. Let us go through quickly. Navigate to sources directory. Compile Parent class first as it is required for Child class using command javac package.
One/Parent. java. Then compile Child class using javac - classpath . Here - classpath is the option to tell javac command from where to pick the classes required for Child. Here we are using fully qualified name for Child.
Ideally you should always compile and launch java classes from the room of the directory structure. While compiling they are treated as java files so directory structure is used while compiling e. But when the classes are compiled, then class files are identified using the package names.
So use the fully qualified names from the root directory i. In our example, sources is the directory and package. One and package. Two are packages. So the classes should be referred as package. One. Parent and package.