CMD under compile run Java program

Get ready for the 1:JDK.

Preparation 2: Environment variable configuration OK.

Preparation 3: This test is JDK8, with JDK10 in eclipse it seems to be unable to use

Meet the above three conditions, it can continue to watch

test_1: Run with package compilation

Code:

 Package HelloWorld;  Public class helloworld{    publicstaticvoid  main (String [] args) {        System.out.println ("Hello World!!!" );    }}

File Location:

compiler directive:javac-d. Helloworld.java (Note-D is followed by A. dot)

Run Result:(need to run with Java package name/file name)

After executing the java instruction, a new folder is created under the current folder, named the package XXX name in your program, here is HelloWorld

If you execute Java HelloWorld directly:

Test_2: Run without package compilation

Code:

 Public class helloworld{    publicstaticvoid  main (String [] args) {        System.out.println ("Run without package compilation");}    }

File Location:

compiler directive:Javac Helloworld.java (note: Compiled bytecode files and source files in the same directory)

Operation Result:

CMD under compile run Java program