Debugging
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When a thread is suspended and the cursor is placed over a variable in the Java editor, the value of that variable is displayed as hover help.
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If you find yourself frequently adding and removing a breakpoint in the
same place, consider disabling the breakpoint when you don't need it
(using Disable Breakpoint in the breakpoint context menu
or the Breakpoints view) and enabling it when needed
again.
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You can use conditional breakpoints in Breakpoint Properties... to
control when a breakpoint actually halts execution. You can specify
whether you want the breakpoint to suspend execution only when the
condition is true, or when the condition value changes.
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You can use Stop in main in a Java Application
launch configuration to cause your program to stop at the main method when
you run it under debug mode.

Debugger
Java editor