From the menu bar, Window → Show View → Console. Alternately, use the keyboard shortcut:

• Mac: Option-Command-Q, then C, or
• Windows: Alt-Shift-Q, then C

Well, this is simple, here are the two easy ways for Windows Users

• Window -> Show View  ->Console, here is the image of Eclipse(Oxygen.2 ) version image
• You can just type "Console" in "Quick Access" textbox area
  
  And click on Console.

For Mac user's, Shortcut is to click Option+Command+Q and then C

Go to Preferences>Run/Debug>Perspectives and select Java Application. Then, go to the right side and change the run perspective to Java, or make your own perspective that includes the console window. Double check that "Open the associated perspective when launching" is set to "Always", or "prompt". I tested the settings below by running while in the debug perspective; it switched to the Java perspective automatically.

The console is a view; a smaller part of any perspective. Because the Java perspective includes the console view, conveniently placed below your code, using the Java perspective and setting it to launch automatically will solve your problem.

You don't have to close Eclipse to fix the issue. Just close "Console" tab from views, go to Windows -> Show View -> Console. Sometimes the listener code for Console view gets crazy and start throwing exceptions.

Hope it helps.

PS: This fix works for Eclipse and STS

Console is for Standard streams. It's not a terminal. The terminal in Eclipse is provided by TM Terminal which became a part of Eclipse CDT Project. It is more likely to be preinstalled in the installation. If it isn't, you can install it from the marketplace.

To open a terminal in Eclipse, you either take the long road or shorter road.

• Long Road:

  Go to Window→Show View→Other. Search for Terminal which is probably under Terminal section instead of General. Select Terminal and press Open.

  You'll see Termial view at the bottom or on left depending on preferences. Click on the left most blue Open a new Terminal icon on the left side of the view panel.

  

• Shorter Road

  • Press Ctrl+Shift+Alt+T and select Local Terminal.

    If you want to open a terminal in the directory of some project or package, click on the project/package before hitting the key combinations.

  • Alternatively, right click on any project/package and click on Show in→Terminal.

As @Sibbo said, you need to enter something into the console in order for the program to work. To get the console up in eclipse, go to Window, Show View, Console (as shown in the picture below.) Then run your program, enter content in the console and await for the same thing to be printed back

The console is wrapped into a tab, down at the bottom. All output is shown in the console tab. It even keeps track of several debug instances that you might be running at the same time, so you can switch between them in the tab's little arrow menu at the corner. If you can't find it, you can always re-open it using

Window > Show View > Console

The tab is configurable within Eclipse preferences, so you can always change its default black-on-white colors to resemble your usual command prompt. And you can drag the console tab and detach it from the IDE so it lives as a separate window that you can move to another monitor.

Take a look at this topic .. I think it is exactly what you want.

There is an answer of how to be able to use step-through debugging from Eclipse.

In eclipse, you can have two console views... On the console view, you have a button called 'open console' (the most right button in the console view). If you click this and select option 3 (new console view), you will see two consoles.

If you right click on the console tab and click on 'detached' the console will be detached from the eclipse frame. (for Eclipse Juno, see the HRJ's comment below)

You can select which output you want to see on each console by clicking the 'display selected console' button (second button from the right on the console view)