java - Wait for a key to be pressed inside loop -

i have java application , want wait key pressed perform action. till have found:

public void keypressed(keyevent e) {   if (e.getkeycode() == keyevent.vk_right ) {         //right arrow key code   } } 

but want inside loop or waits until key matches.

please help.

update:

i want program waiting until key pressed , when pressed want trigger action. example:

public void something(){   //do   wait until key pressed   if( key pressed arrow key){     something();   }else{     wait key pressed   } }  public void dootherthing(){  //do other thing } 

i working in swing , don't want gui irresponsible. i.e. when call dootherthing click of button. should , waiting should over.

swing (and guis) event driven environments. is, happens, react it.

having loop waiting kind of action kind of counter intuitive (imho).

generally speaking, should avoid keylisteners if can. have issues key focus. key bindings api has ways on come limitation.

it allows register keystroke against action , allows program sit , wait till happens...

import java.awt.borderlayout; import java.awt.color; import java.awt.dimension; import java.awt.eventqueue; import java.awt.graphics; import java.awt.graphics2d; import java.awt.gridbagconstraints; import java.awt.gridbaglayout; import java.awt.event.actionevent; import java.awt.event.keyevent; import javax.swing.abstractaction; import javax.swing.actionmap; import javax.swing.inputmap; import javax.swing.jframe; import javax.swing.jpanel; import javax.swing.keystroke; import javax.swing.uimanager; import javax.swing.unsupportedlookandfeelexception; import javax.swing.border.lineborder;  public class keybindings {      public static void main(string[] args) {         new keybindings();     }      public keybindings() {         eventqueue.invokelater(new runnable() {             @override             public void run() {                 try {                     uimanager.setlookandfeel(uimanager.getsystemlookandfeelclassname());                 } catch (classnotfoundexception | instantiationexception | illegalaccessexception | unsupportedlookandfeelexception ex) {                 }                  jframe frame = new jframe("testing");                 frame.setdefaultcloseoperation(jframe.exit_on_close);                 frame.setlayout(new borderlayout());                 frame.add(new testpane());                 frame.pack();                 frame.setlocationrelativeto(null);                 frame.setvisible(true);             }         });     }      public class testpane extends jpanel {          public testpane() {              setlayout(new gridbaglayout());             gridbagconstraints gbc = new gridbagconstraints();             gbc.gridx = 1;             gbc.gridy = 0;              add(new keypane(keyevent.vk_up, 0), gbc);              gbc.gridy = 2;             add(new keypane(keyevent.vk_down, 0), gbc);              gbc.gridx = 0;             gbc.gridy = 1;             add(new keypane(keyevent.vk_left, 0), gbc);              gbc.gridx = 2;             add(new keypane(keyevent.vk_right, 0), gbc);          }     }      public class keypane extends jpanel {          public keypane(int keycode, int modifier) {              setborder(new lineborder(color.dark_gray));              inputmap im = getinputmap(when_in_focused_window);             actionmap = getactionmap();              im.put(keystroke.getkeystroke(keycode, modifier, false), "keypressed");             im.put(keystroke.getkeystroke(keycode, modifier, true), "keyreleased");              am.put("keypressed", new abstractaction() {                 @override                 public void actionperformed(actionevent e) {                     setbackground(color.red);                 }             });              am.put("keyreleased", new abstractaction() {                 @override                 public void actionperformed(actionevent e) {                     setbackground(uimanager.getcolor("panel.background"));                 }             });          }          @override         public dimension getpreferredsize() {             return new dimension(20, 20);         }     }  }