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📜  Java中的 AtomicInteger incrementAndGet() 方法及示例

📅  最后修改于: 2022-05-13 01:54:30.058000             🧑  作者: Mango

Java中的 AtomicInteger incrementAndGet() 方法及示例

Java.util.concurrent.atomic.AtomicInteger.incrementAndGet()是Java中的一个内置方法,它将先前的值加一并返回更新后的值,该值是数据类型int

句法:

public final int incrementAndGet()

参数:该函数不接受单个参数。
返回值:函数将递增操作后的值返回到前一个值。

下面的程序演示了该函数:

方案一:

Java
// Java program that demonstrates
// the incrementAndGet() function
 
import java.util.concurrent.atomic.AtomicInteger;
 
public class GFG {
    public static void main(String args[])
    {
 
        // Initially value as 0
        AtomicInteger val
            = new AtomicInteger(0);
 
        System.out.println("Previous value: "
                           + val);
 
        // Increment and get
        int res
            = val.incrementAndGet();
 
        // Prints the updated value
        System.out.println("Current value: "
                           + res);
    }
}


Java
// Java program that demonstrates
// the incrementAndGet() function
 
import java.util.concurrent.atomic.AtomicInteger;
 
public class GFG {
    public static void main(String args[])
    {
 
        // Initially value as 18
        AtomicInteger val
            = new AtomicInteger(18);
 
        System.out.println("Previous value: "
                           + val);
 
        // Increment and get new value
        int res = val.incrementAndGet();
 
        // Prints the updated value
        System.out.println("Current value: "
                           + res);
    }
}


输出:
Previous value: 0
Current value: 1

方案二:

Java

// Java program that demonstrates
// the incrementAndGet() function
 
import java.util.concurrent.atomic.AtomicInteger;
 
public class GFG {
    public static void main(String args[])
    {
 
        // Initially value as 18
        AtomicInteger val
            = new AtomicInteger(18);
 
        System.out.println("Previous value: "
                           + val);
 
        // Increment and get new value
        int res = val.incrementAndGet();
 
        // Prints the updated value
        System.out.println("Current value: "
                           + res);
    }
}
输出:
Previous value: 18
Current value: 19

参考: https: Java/util/concurrent/atomic/AtomicInteger.html#incrementAndGet-