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When we execute the command, we get the below output. Here, make is the utility command, while -f is an argument for file and makefile is the file name of our makefile. To execute the makefile, we use the following command in the command line. The last target is to clean the class files using the command $(RM) *.class. In the next statement, we create another target classes that replaces the files containing. We specify the default target with the CLASSES macro. Makefiles understand only tab space, or we can break the statement using the \ operator. We create another macro that contains all the Java files that we want to compile when the makefile is executed. java.class is the target while $(JC) $*.java is the command to execute to create the target. Now we create a target using the syntax we learned above. In the following makefile, we first specify the compiler to use, javac, and store it in a variable JC. To compile all the files, we need to use the javac command every time, but we use the makefile to compile these files. The first Java file has three classes, while the two files contain single classes.
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We have three Java files for the example. Note that when a modification occurs in a single file, makefile compiles only the changed file instead of compiling every file. This time can be saved using a makefile to compile the Java files whenever there is a change. We can use variables in a makefile to store text strings to remove duplicate usage of commands and rules.Ĭompiling a project with several files is a time-taking task, and we have to repeat the same commands whenever we make any changes in the files. We write the commands in command that begins with a tab. The prerequisites or dependencies are the files used to create the target. In the above syntax, a target is the program’s name to be generated. A simple makefile contains variables and rules.īelow is a basic syntax for creating a rule. Use the Makefile to Manage Large Projects in JavaĪ Makefile is a way to manage large project files by compiling and linking them. When we write programs for a large project, we might need to compile every program manually, which can be time-consuming, and this is where a makefile can make this task easy and fast. Use the Makefile in Java With an ExampleĪ Makefile is a specially formatted file required by the make utility when used.Use the Makefile to Manage Large Projects in Java.
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