Example usage for java.util Stack peek

Introduction

In this page you can find the example usage for java.util Stack peek.

Prototype

public synchronized E peek()

Source Link

Document

Looks at the object at the top of this stack without removing it from the stack.

Usage

From source file:MainClass.java

public static void main(String args[]) {
    Stack s = new Stack();
    s.push("A");/*from w ww. ja  v  a 2 s  .c o  m*/
    s.push("B");
    s.push("C");

    System.out.println("Next: " + s.peek());
}

From source file:Main.java

public static void main(String args[]) {
    Stack<String> s = new Stack<String>();
    s.push("A");/*from   w  w  w.  j  a  v a 2  s .  c  om*/
    s.push("B");
    s.push("C");

    System.out.println("Next: " + s.peek());
}

From source file:MainClass.java

public static void main(String args[]) {
    Stack s = new Stack();
    s.push("A");/*from ww  w . ja va 2  s  .com*/
    s.push("B");
    s.push("C");

    System.out.println("Next: " + s.peek());
    s.push("D");

    System.out.println(s.pop());
    s.push("E");
    s.push("F");

    int count = s.search("E");
    while (count != -1 && count > 1) {
        s.pop();
        count--;
    }
    System.out.println(s);
}

From source file:StackExample.java

public static void main(String args[]) {
    Stack s = new Stack();
    s.push("Java");
    s.push("Source");
    s.push("and");

    System.out.println("Next: " + s.peek());
    s.push("Support");
    System.out.println(s.pop());//from w w w. j  a v a2  s  .  c o  m
    s.push(".");
    int count = s.search("Java");
    while (count != -1 && count > 1) {
        s.pop();
        count--;
    }
    System.out.println(s.pop());
    System.out.println(s.empty());
}

From source file:Main.java

public static void main(String args[]) {
    Stack<String> s = new Stack<String>();
    s.push("A");//from   w ww.  j ava 2s. c  o  m
    s.push("B");
    s.push("C");

    System.out.println("Next: " + s.peek());
    s.push("D");

    System.out.println(s.pop());
    s.push("E");
    s.push("F");

    int count = s.search("E");
    while (count != -1 && count > 1) {
        s.pop();
        count--;
    }
    System.out.println(s);
}

From source file:Main.java

public static void main(String args[]) {

    Stack st = new Stack();

    st.push("Java");
    st.push("Source");
    st.push("from java2s.com");

    // checking the top object
    System.out.println("Top object is: " + st.peek());
}

From source file:de.codesourcery.gittimelapse.Main.java

public static void main(String[] args) throws IOException, RevisionSyntaxException, GitAPIException {
    final Stack<String> argStack = new Stack<>();

    final String testFile = "/home/tgierke/workspace/voipmanager/voipmngr/voipmngr/build.xml";
    if (ArrayUtils.isEmpty(args) && new File(testFile).exists()) {
        argStack.push(testFile);//from   ww w. ja  v  a2s.com
    }

    File file = null;
    while (!argStack.isEmpty()) {
        if ("-d".equals(argStack.peek())) {
            DEBUG_MODE = true;
            argStack.pop();
        } else {
            file = new File(argStack.pop());
        }
    }

    if (file == null) {
        System.err.println("ERROR: Invalid command line.");
        System.err.println("Usage: [-d] <versioned file>\n");
        return;
    }

    final GitHelper helper = new GitHelper(file.getParentFile());

    MyFrame frame = new MyFrame(file, helper);
    frame.setPreferredSize(new Dimension(640, 480));
    frame.pack();
    frame.setVisible(true);
}

From source file:edu.usc.squash.Main.java

public static void main(String[] args) {
    Stack<Module> modulesStack;
    Module module;// w  w  w .j a  v  a  2 s.  co  m

    if (parseInputs(args) == false) {
        System.exit(-1); //The input files do not exist
    }

    String separator = "----------------------------------------------";
    System.out.println("Squash v2.0");
    System.out.println(separator);
    long start = System.currentTimeMillis();

    // Parsing the input library
    Library library = QLib.readLib(libraryPath);
    library.setCurrentECC(currentECC);

    HashMap<String, Module> modules = parseQASMHF(library);
    Module mainModule = modules.get("main");

    //Finding max{A_L_i}
    int childModulesLogicalAncillaReq;
    int moduleAncillaReq;

    modulesStack = new Stack<Module>();

    modulesStack.add(mainModule);
    while (!modulesStack.isEmpty()) {
        module = modulesStack.peek();
        if (!module.isVisited() && module.isChildrenVisited()) {
            //Finding the maximum 
            childModulesLogicalAncillaReq = 0;
            for (Module child : module.getDFG().getModules()) {
                childModulesLogicalAncillaReq = Math.max(childModulesLogicalAncillaReq, child.getAncillaReq());
            }
            moduleAncillaReq = module.getAncillaQubitNo() + childModulesLogicalAncillaReq;
            module.setAncillaReq(moduleAncillaReq);
            //            System.out.println("Module "+module.getName()+" requires "+moduleAncillaReq+" ancilla.");

            modulesStack.pop();
            module.setVisited();
        } else if (module.isVisited()) {
            modulesStack.pop();
        } else if (!module.isChildrenVisited()) {
            modulesStack.addAll(module.getDFG().getModules());
            module.setChildrenVisited();
        }
    }

    int totalLogicalAncilla = mainModule.getAncillaReq();

    System.out.println("A_L_i_max: " + totalLogicalAncilla);

    final int Q_L = mainModule.getDataQubitNo();

    /* 
     * In order traversal of modules
     */
    //Making sure all of the modules are unvisited
    for (Module m : modules.values()) {
        m.setUnvisited();
    }
    modulesStack = new Stack<Module>();

    modulesStack.add(mainModule);
    while (!modulesStack.isEmpty()) {
        module = modulesStack.peek();
        if (!module.isVisited() && module.isChildrenVisited()) {
            System.out.println(separator);

            mapModule(module, k, physicalAncillaBudget, totalLogicalAncilla, Q_L, beta_pmd, alpha_int,
                    gamma_memory, library);

            modulesStack.pop();
            module.setVisited();
        } else if (module.isVisited()) {
            modulesStack.pop();
        } else if (!module.isChildrenVisited()) {
            modulesStack.addAll(module.getDFG().getModules());
            module.setChildrenVisited();
        }
    }

    System.out.println(separator);
    double runtime = (System.currentTimeMillis() - start) / 1000.0;
    System.out.println("B_P: " + B_P);
    System.out.println("Total Runtime:\t" + runtime + " sec");
}

From source file:Main.java

public static <E> E peekOrNull(final Stack<? extends E> stack) {
    return !isEmpty(stack) ? stack.peek() : null;
}

From source file:org.sakaiproject.signup.tool.entityproviders.CopyFileProcessor.java

public static Element timeslotToXml(SignupTimeslot timeslot, Document doc, Stack<Element> stack) {
    Element element = doc.createElement("timeslot");

    if (stack.isEmpty()) {
        doc.appendChild(element);/*from  w w w.  j  a  v a 2s . co  m*/
    } else {
        ((Element) stack.peek()).appendChild(element);
    }

    stack.push(element);

    Date startTime = timeslot.getStartTime();
    Date endTime = timeslot.getEndTime();
    Format formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String strStartTime = formatter.format(startTime);
    String strEndTime = formatter.format(endTime);

    element.setAttribute("endTime", strEndTime);
    element.setAttribute("startTime", strStartTime);

    stack.pop();

    return element;
}