Java

• Compiling and executing JAVA programs from command line.

  • javac -classpath lib/\* src/*.java [To compile class files with including some jar files]
  • java -classpath .:PATH_TO_LIB_FOLDER/\* NAME_OF_CLASS_FILE_WITHOUT_EXTENSION [To execute a java class file including some jar files]
  • Note: In the above command, the dot (‘.’) was included so that all the class files present in the current directory could be used while executing the class.

• Avoid 3rd party Jars printing to your console.

  • If you want to avoid 3rd party jars printing log messages in your console, then you can print their output to a dummy console in the following way:

    PrintStream originalStream = System.out;
    PrintStream dummyStream = new PrintStream(new OutputStream()
    {
      public void write(int b)
      {
        //NO-OP
      }
    });
    System.setOut(dummyStream);
    //You want to stop printing from here onwards
            ....
            ....
    System.setOut(originalStream);
    // You want to resume printing now
    

• Help For Fixing Memory Leaks in Java