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POHow to use Thread in java
 

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    <p>Let's assume that there are three methods in a class as follows and I need to call each method one after another one, but as each method is running on a separate Thread I get errors, please tell me a way to call each of following methods as,</p> <pre><code>..... methodOne(); methodTwo(); methodTree(); ..... public Class Test{ public void methodOne(){ new Thread(new Runnable(){ @Override public void run() { ..... } }).start(); } public void methodTwo(){ new Thread(new Runnable(){ @Override public void run() { ..... } }).start(); } public void methodThree(){ new Thread(new Runnable(){ @Override public void run() { ..... } }).start(); } } </code></pre> <p>I get following errors</p> <pre><code>java.util.ConcurrentModificationException at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:778) at java.util.LinkedList$ListItr.next(LinkedList.java:713) at Manufacturing.MonthEnd.FinishMonth.fillPreviousMonthBalanceRec(FinishMonth.java:141) at Manufacturing.MonthEnd.FinishMonth.closeMonth(FinishMonth.java:52) at Manufacturing.MonthControllerView.btnCloseMonthActionPerformed(MonthControllerView.java:588) at Manufacturing.MonthControllerView.access$400(MonthControllerView.java:28) at Manufacturing.MonthControllerView$6.actionPerformed(MonthControllerView.java:465) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2012) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2335) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:404) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:253) at java.awt.Component.processMouseEvent(Component.java:6203) at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) at java.awt.Component.processEvent(Component.java:5968) at java.awt.Container.processEvent(Container.java:2105) at java.awt.Component.dispatchEventImpl(Component.java:4564) at java.awt.Container.dispatchEventImpl(Container.java:2163) at java.awt.Component.dispatchEvent(Component.java:4390) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4461) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4125) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4055) at java.awt.Container.dispatchEventImpl(Container.java:2149) at java.awt.Window.dispatchEventImpl(Window.java:2478) at java.awt.Component.dispatchEvent(Component.java:4390) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:649) at java.awt.EventQueue.access$000(EventQueue.java:96) at java.awt.EventQueue$1.run(EventQueue.java:608) at java.awt.EventQueue$1.run(EventQueue.java:606) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116) at java.awt.EventQueue$2.run(EventQueue.java:622) at java.awt.EventQueue$2.run(EventQueue.java:620) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105) at java.awt.EventQueue.dispatchEvent(EventQueue.java:619) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177) at java.awt.EventDispatchThread.run(EventDispatchThread.java:138) </code></pre>
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    1. COWhat errors are you getting? Can you post the **stacktrace** / **exceptions** on your question?
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