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How can I watch the contents of several variables (for example, TreeSet's) simultaneously? I can watch contents of one TreeSet, clicking on it in "Variables" window, but I have no idea how to do that for several variables.
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Variables/Expression view – Shows the declared variables and their values. Press Ctrl+Shift+d or Ctrl+Shift+i on a selected variable or expression to show its value. You can also add a permanent watch on an expression/variable that will then be shown in the Expressions view when debugging is on.
Setting a Watch on a Variable, Field, or Other Expression To set a watch on an identifier such as a variable or field, right-click the variable or field in the Source Editor and choose New Watch. The identifier is then added to the Watches window. To create a watch for another expression: Choose Run | New Watch.
While debugging you can use the "Display" window where you can write pieces of code and "execute" them with inspect (highlight the code -> right click -> inspect). In that window you have access to all variables of the breakpoint's context.
In Eclipse that view is called Expressions - for watch expressions. It opens regularly with the Debug view, but you can open it using "Window"->"Show view"->"Other"->"Debug"->"Expressions".
You can use Expressions windows: while debugging, menu window -> Show View -> Expressions, then it has place to type variables of which you need to see contents
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You can add a watchpoint for each variable you're interested in.
A watchpoint is a special breakpoint that stops the execution of an application whenever the value of a given expression changes, without specifying where it might occur. Unlike breakpoints (which are line-specific), watchpoints are associated with files. They take effect whenever a specified condition is true, regardless of when or where it occurred. You can set a watchpoint on a global variable by highlighting the variable in the editor, or by selecting it in the Outline view.
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