AtomicLong api詳解

今天學習AtomicLong類，該類是JUC原子包中的類，通過單元測試代碼把所有public api方法跑了一遍，大致瞭解了底層實現 

package test.java.util.concurrent.atomic;


import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicLong;
import java.util.function.IntBinaryOperator;
import java.util.function.IntUnaryOperator;
import java.util.function.LongBinaryOperator;
import java.util.function.LongUnaryOperator;

import org.junit.Test;

/**
 * AtomicLong的測試類
 *
 * @author zqw
 * @date 2020-06-18 22:52:36
 */
public class AtomicLongTest {
        /**
         *  通過整數值初始化構造函數
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testConstructLong(){
                AtomicLong atomicLong=new AtomicLong(3L);
                System.out.println(atomicLong.get());
        }
        /**
         *  無參構造函數，默認爲0
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testConstructEmpty(){
                AtomicLong atomicLong=new AtomicLong();
                System.out.println(atomicLong.get());
        }
        /**
         * 獲取value值
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testGet(){
                AtomicLong atomicLong=new AtomicLong();
                System.out.println(atomicLong.get());
        }
        /**
         * 設置value值
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testSet(){
                AtomicLong atomicLong=new AtomicLong(4);
                atomicLong.set(43L);
                System.out.println(atomicLong.get());
        }
        /**
         * 設置value值
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testLazySet(){
                AtomicLong atomicLong=new AtomicLong(3);
                atomicLong.lazySet(33);
                System.out.println(atomicLong.get());
        }
        /**
         * 獲取value值並設置成新值
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testGetAndSet(){
                AtomicLong atomicLong=new AtomicLong(3);
                System.out.println(atomicLong.getAndSet(223));
                System.out.println(atomicLong.get());
        }
        /**
         * 如果value爲expect參數值，則更新成新值並返回true
         * 否則返回false
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testCompareAndSet(){
                AtomicLong atomicLong=new AtomicLong(3);
                System.out.println(atomicLong.compareAndSet(3,33));
                System.out.println(atomicLong.get());
        }
        /**
         * 如果value爲expect參數值，則更新成新值並返回true
         * 否則返回false
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testWeakCompareAndSet(){
                AtomicLong atomicLong=new AtomicLong(3);
                System.out.println(atomicLong.weakCompareAndSet(3,23));
                System.out.println(atomicLong.get());
        }
        /**
         * 獲取value值並將值加一
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testGetAndIncrement(){
                AtomicLong atomicLong=new AtomicLong(3);
                System.out.println(atomicLong.getAndIncrement());
                System.out.println(atomicLong.get());
        }
        /**
         * 獲取value值並將值減一
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testGetAndDecrement(){
                AtomicLong atomicLong=new AtomicLong(3);
                System.out.println(atomicLong.getAndDecrement());
                System.out.println(atomicLong.get());
        }
        /**
         * 獲取value值並將值加一
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testGetAndAdd(){
                AtomicLong atomicLong=new AtomicLong(3);
                System.out.println(atomicLong.getAndAdd(3));
                System.out.println(atomicLong.get());
        }
        /**
         * 將值加一併獲取value值
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testIncrementAndGet(){
                AtomicLong atomicLong=new AtomicLong(3);
                System.out.println(atomicLong.incrementAndGet());
        }
        /**
         * 將值減一併獲取value值
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testDecrementAndGet(){
                AtomicLong AtomicLong=new AtomicLong(3);
                System.out.println(AtomicLong.decrementAndGet());
        }
        /**
         * 將值增加對應的值並獲取value值
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testAddAndGet(){
                AtomicLong atomicLong=new AtomicLong(3);
                System.out.println(atomicLong.addAndGet(33));
        }
        /**
         * 獲取value值並更新成新值
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testGetAndUpdate(){
                AtomicLong atomicLong=new AtomicLong(3);
                LongUnaryOperator operator=new LongUnaryOperator() {
                        @Override
                        public long applyAsLong(long operand) {
                                return 333;
                        }
                };
                System.out.println(atomicLong.getAndUpdate(operator));
                System.out.println(atomicLong.get());
        }
        /**
         * 更新成新值並獲取value值
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testUpdateAndGet(){
                AtomicLong atomicLong=new AtomicLong(3);
                LongUnaryOperator operator=new LongUnaryOperator() {
                        @Override
                        public long applyAsLong(long operand) {
                                return 333;
                        }
                };
                System.out.println(atomicLong.updateAndGet(operator));
        }
        /**
         * 獲取value值並更新成新值
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testGetAndAccumulate(){
                AtomicLong atomicLong=new AtomicLong(3);
                LongBinaryOperator operator=new LongBinaryOperator() {
                        @Override
                        public long applyAsLong(long left, long right) {
                                return 332;
                        }
                };
                System.out.println(atomicLong.getAndAccumulate(23,operator));
                System.out.println(atomicLong.get());
        }
        /**
         * 更新成新值並獲取value值
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testAccumulateAndGet(){
                AtomicLong atomicLong=new AtomicLong(3);
                LongBinaryOperator operator=new LongBinaryOperator() {
                        @Override
                        public long applyAsLong(long left, long right) {
                                return 332;
                        }
                };
                System.out.println(atomicLong.accumulateAndGet(23,operator));
        }
        /**
         * Integer.toString()
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testToString(){
                AtomicLong atomicLong=new AtomicLong(33);
                System.out.println(atomicLong.toString());
        }
        /**
         * 獲取value的int值
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testIntValue(){
                AtomicLong atomicLong=new AtomicLong(33);
                System.out.println(atomicLong.intValue());
        }
        /**
         * 獲取value的long值
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testLongValue(){
                AtomicLong atomicLong=new AtomicLong(33);
                System.out.println(atomicLong.longValue());
        }
        /**
         * 獲取value的float值
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testFloatValue(){
                AtomicLong atomicLong=new AtomicLong(33);
                System.out.println(atomicLong.floatValue());
        }

        /**
         * 獲取value的double值
         *
         * @throws
         * @date 2020/6/16 23:46
         */
        @Test
        public void testDoubleValue(){
                AtomicLong atomicLong=new AtomicLong(33);
                System.out.println(atomicLong.doubleValue());
        }
}