简单的Java程序在Eclipse EE IDE上不产生任何输出

Question

I am trying to execute a simple Java program in newly setup Eclipse IDE, but cannot see any output in console. Below is my program

/** 
 * The HelloWorldApp class implements an application that
 * simply prints "Hello World!" to standard output.
 */
class HelloWorldApp {
    public static void main(String[] args) {
        System.out.println("Hello World!"); // Display the string.
    }
}

Have checked build paths for JRE and JDK is added to environment variables as well. I am missing some configuration settings but not able to figure that out. Any leads will be helpful.

---

Compilation is working perfectly file and .classes work as expected via cmd. Added a breakpoint in the main method. When I did debug As -> application, error is thrown, its not able to launch the class.

Error Thrown --> Cannot connect to VM Socket operation on nonsocket: configureBlocking

Answer 1

There is a small pull-down icon on the right of the console that lets you select which console you want to see. Maybe you accidentally selected a different console.

If this doesn't work try next.

Go to run and choose Run Configurations -> Common and in the Standard Input and Output configuration see if Allocate Console is selected.

Answer 2

Use the command prompt first to check if JDK, and JRE properly are install. Then if the problem still exit after you set up the path permanently. Reinstall Eclipse IDE For executing any java program, you need to

1. List item install the JDK if you don't have installed it, download the JDK and install it.
2. set path of the jdk/bin directory. http://www.javatpoint.com/how-to-set-path-in-java
3. create the java program compile and run the java program
4. open command prompt then type javac Simple.java
5. then type java Simple