How to use the debugger and debugging features of Eclipse?

To use the debugger and debugging features of Eclipse, follow these steps:

1. Set Breakpoints: Open the Java file you want to debug. Click in the left margin of the line where you want to set a breakpoint. A blue dot appears, indicating the breakpoint is set.

   Example: If you have a line int result = a + b;, click in the margin next to this line to set a breakpoint.

2. Start Debugging: Right-click on your project in the Project Explorer and select Debug As > Java Application. Alternatively, you can click the debug icon (a bug) in the toolbar.

3. Debug Perspective: Eclipse will switch to the Debug perspective automatically. Here, you can see the current state of your program, including variable values and the call stack.

4. Step Through Code: Use the debugging toolbar to control the execution of your program.

   • Step Over (F6): Executes the current line and moves to the next line.
   • Step Into (F5): If the current line contains a method call, it steps into that method.
   • Step Return (F7): Executes the rest of the current method and returns to the caller.
   • Resume (F8): Continues execution until the next breakpoint is reached.

5. Inspect Variables: While debugging, you can hover over variables to see their current values or open the Variables view to inspect them more thoroughly.

6. Evaluate Expressions: Use the Expressions view to evaluate expressions or calculate values during debugging.

Example: Suppose you have a simple Java program:

public class DebugExample {
    public static void main(String[] args) {
        int a = 10;
        int b = 20;
        int result = a + b; // Breakpoint set here
        System.out.println("Result: " + result);
    }
}

After setting a breakpoint on the line int result = a + b;, start debugging. Eclipse will pause execution at this line, allowing you to inspect the values of a and b, step through the code, and see how result is calculated.

For more advanced debugging features and integration with cloud-based development environments, consider using services like Tencent Cloud's Cloud Studio, which provides a powerful IDE with integrated debugging tools for cloud-native application development.