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error handling

 
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i cannot understand this error


java.lang.NumberFormatException: For input string: " "

at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)

at java.lang.Integer.parseInt(Integer.java)

at mypackage.Calculator$16.actionPerformed(Calculator.java:182)

at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)

at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)

at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)

at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)

at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:245)

at java.awt.Component.processMouseEvent(Component.java:5100)

at java.awt.Component.processEvent(Component.java:4897)

at java.awt.Container.processEvent(Container.java:1569)

at java.awt.Component.dispatchEventImpl(Component.java:3615)

at java.awt.Container.dispatchEventImpl(Container.java:1627)

at java.awt.Component.dispatchEvent(Component.java)

at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java)

at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)

at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)

at java.awt.Container.dispatchEventImpl(Container.java:1613)

at java.awt.Component.dispatchEvent(Component.java)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:458)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
 
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If the String that you are trying to parse has a space, then it throws this Exception. Try another approach.
 
Jherald Lacambra
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thnx for the reply..

how can i use the Integer.parseInt() method?..

where should i equate it?
 
Greenhorn
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to use the parseInt mehtod, you have to give the parameter which is a strnig but it has the integer value.

That is,
String str="100"
int i=Integer.parseInt(str);
 
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