JDK 11 jdk.jcmd.jmod is the JMOD file for JDK 11 JCmd tool, which can be invoked by the "jcmd" command.

JDK 11 JCmd tool compiled class files are stored in \fyicenter\jdk-11.0.1\jmods\jdk.jcmd.jmod.

JDK 11 JCmd tool compiled class files are also linked and stored in the \fyicenter\jdk-11.0.1\lib\modules JImage file.

JDK 11 JCmd source code files are stored in \fyicenter\jdk-11.0.1\lib\src.zip\jdk.jcmd.

You can click and view the content of each source code file in the list below.

⏎ sun/tools/jstat/ExpressionExecuter.java

/*
 * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package sun.tools.jstat;

import java.util.*;
import sun.jvmstat.monitor.*;

/**
 * A class implementing the ExpressionEvaluator to evaluate an expression
 * in the context of the available monitoring data.
 *
 * @author Brian Doherty
 * @since 1.5
 */
public class ExpressionExecuter implements ExpressionEvaluator {
    private static final boolean debug =
            Boolean.getBoolean("ExpressionEvaluator.debug");
    private MonitoredVm vm;
    private HashMap<String, Object> map = new HashMap<String, Object>();

    ExpressionExecuter(MonitoredVm vm) {
        this.vm = vm;
    }

    /*
     * evaluate the given expression.
     */
    public Object evaluate(Expression e) {
        if (e == null) {
            return null;
        }

        if (debug) {
            System.out.println("Evaluating expression: " + e);
        }

        if (e instanceof Literal) {
            return ((Literal)e).getValue();
        }

        if (e instanceof Identifier) {
            Identifier id = (Identifier)e;
            if (map.containsKey(id.getName())) {
                return map.get(id.getName());
            } else {
                // cache the data values for coherency of the values over
                // the life of this expression executer.
                Monitor m = (Monitor)id.getValue();
                Object v = m.getValue();
                map.put(id.getName(), v);
                return v;
            }
        }

        Expression l = e.getLeft();
        Expression r = e.getRight();

        Operator op = e.getOperator();

        if (op == null) {
            return evaluate(l);
        } else {
            double lval = ((Number)evaluate(l)).doubleValue();
            double rval = ((Number)evaluate(r)).doubleValue();
            double result = op.eval(lval, rval);
            if (debug) {
                System.out.println("Performed Operation: " + lval + op + rval
                                   + " = " + result);
            }
            return Double.valueOf(result);
        }
    }
}

⏎ sun/tools/jstat/ExpressionExecuter.java

Or download all of them as a single archive file:

File name: jdk.jcmd-11.0.1-src.zip
File size: 47892 bytes
Release date: 2018-11-04
Download 

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