import com.sun.tools.example.debug.expr.ExpressionParser; //导入依赖的package包/类
public Value evaluate(final StackFrame f, String expr)
    throws ParseException,
                                        InvocationException,
                                        InvalidTypeException,
                                        ClassNotLoadedException,
                                        NoSessionException,
                                        IncompatibleThreadStateException {
    ExpressionParser.GetFrame frameGetter = null;
    ensureActiveSession();
    if (f != null) {
        frameGetter = new ExpressionParser.GetFrame() {
            @Override
            public StackFrame get() /* throws IncompatibleThreadStateException */ {
                return f;
            }
        };
    }
    return ExpressionParser.evaluate(expr, vm(), frameGetter);
}
 

import com.sun.tools.example.debug.expr.ExpressionParser; //导入依赖的package包/类
private String getStringValue() {
     Value val = null;
     String valStr = null;
     try {
          val = ExpressionParser.getMassagedValue();
          valStr = val.toString();
     } catch (ParseException e) {
          String msg = e.getMessage();
          if (msg == null) {
              MessageOutput.printException(msg, e);
          } else {
              String s;
              try {
                  s = MessageOutput.format(msg);
              } catch (MissingResourceException mex) {
                  s = e.toString();
              }
              MessageOutput.printDirectln(s);
          }
     }
     return valStr;
}
 

import com.sun.tools.example.debug.expr.ExpressionParser; //导入依赖的package包/类
private Value evaluate(String expr) throws ParseException,
                                        InvocationException,
                                        InvalidTypeException,
                                        ClassNotLoadedException,
                                        IncompatibleThreadStateException {
    ExpressionParser.GetFrame frameGetter =
        new ExpressionParser.GetFrame() {
            @Override
            public StackFrame get()
                throws IncompatibleThreadStateException
            {
                try {
                    return context.getCurrentFrame();
                } catch (VMNotInterruptedException exc) {
                    throw new IncompatibleThreadStateException();
                }
            }
        };
    return ExpressionParser.evaluate(expr, runtime.vm(), frameGetter);
}
 

import com.sun.tools.example.debug.expr.ExpressionParser; //导入依赖的package包/类
private Value evaluate(String expr) {
    Value result = null;
    ExpressionParser.GetFrame frameGetter = null;
    try {
        final ThreadInfo threadInfo = ThreadInfo.getCurrentThreadInfo();
        if ((threadInfo != null) && (threadInfo.getCurrentFrame() != null)) {
            frameGetter = new ExpressionParser.GetFrame() {
                    @Override
                    public StackFrame get() throws IncompatibleThreadStateException {
                        return threadInfo.getCurrentFrame();
                    }
                };
        }
        result = ExpressionParser.evaluate(expr, Env.vm(), frameGetter);
    } catch (InvocationException ie) {
        MessageOutput.println("Exception in expression:",
                              ie.exception().referenceType().name());
    } catch (Exception ex) {
        String exMessage = ex.getMessage();
        if (exMessage == null) {
            MessageOutput.printException(exMessage, ex);
        } else {
            String s;
            try {
                s = MessageOutput.format(exMessage);
            } catch (MissingResourceException mex) {
                s = ex.toString();
            }
            MessageOutput.printDirectln(s);// Special case: use printDirectln()
        }
    }
    return result;
}