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Java example source code file (AtomicBoolean.java)

This example Java source code file (AtomicBoolean.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

atomically, atomicboolean, spurious, string

The AtomicBoolean.java Java example source code

/*
 * Copyright (C) 2015 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */  /**
 * Atomically sets the value to the given updated value
 * if the current value {@code ==} the expected value.
 *
 * <p>May fail spuriously
 * and does not provide ordering guarantees, so is only rarely an
 * appropriate alternative to {@code compareAndSet}.
 *
 * @param expect the expected value
 * @param update the new value
 * @return true if successful.
 */

package java.util.concurrent.atomic;

/**
 * GWT emulation of AtomicBoolean.
 */
public class AtomicBoolean implements java.io.Serializable {
  private boolean value;

  public AtomicBoolean(boolean initialValue) {
    value = initialValue;
  }

  public AtomicBoolean() {
  }

  public final boolean get() {
    return value;
  }

  public final boolean compareAndSet(boolean expect, boolean update) {
    if (get() == expect) {
      set(update);
      return true;
    }

    return false;
  }

  public boolean weakCompareAndSet(boolean expect, boolean update) {
    return compareAndSet(expect, update);
  }

  public final void set(boolean newValue) {
    value = newValue;
  }

  public final void lazySet(boolean newValue) {
    set(newValue);
  }

  public final boolean getAndSet(boolean newValue) {
    boolean current = get();
    set(newValue);
    return current;
  }

  public String toString() {
    return Boolean.toString(get());
  }
}

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