Java 16 新特性概述（二）

@Deprecated(since="9", forRemoval = true)
public class PdaiDeprecatedTest {
}

public final class Integer extends Number implements Comparable<Integer> {
// ... 
    /**
     * Constructs a newly allocated {@code Integer} object that
     * represents the specified {@code int} value.
     *
     * @param   value   the value to be represented by the
     *                  {@code Integer} object.
     *
     * @deprecated
     * It is rarely appropriate to use this constructor. The static factory
     * {@link #valueOf(int)} is generally a better choice, as it is
     * likely to yield significantly better space and time performance.
     */
    @Deprecated(since="9")
    public Integer(int value) {
        this.value = value;
    }
// ... 
}

/*
* <p>This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
 * class; programmers should treat instances that are
 * {@linkplain #equals(Object) equal} as interchangeable and should not
 * use instances for synchronization, or unpredictable behavior may
 * occur. For example, in a future release, synchronization may fail.
 *
 * <p>Implementation note: The implementations of the "bit twiddling"
 * methods (such as {@link #highestOneBit(int) highestOneBit} and
 * {@link #numberOfTrailingZeros(int) numberOfTrailingZeros}) are
 * based on material from Henry S. Warren, Jr.'s <i>Hacker's
 * Delight</i>, (Addison Wesley, 2002).
 *
 * @author  Lee Boynton
 * @author  Arthur van Hoff
 * @author  Josh Bloch
 * @author  Joseph D. Darcy
 * @since 1.0
 */
@jdk.internal.ValueBased
public final class Integer extends Number
        implements Comparable<Integer>, Constable, ConstantDesc {
// ... 
  /**
    * Constructs a newly allocated {@code Integer} object that
    * represents the specified {@code int} value.
    *
    * @param   value   the value to be represented by the
    *                  {@code Integer} object.
    *
    * @deprecated
    * It is rarely appropriate to use this constructor. The static factory
    * {@link #valueOf(int)} is generally a better choice, as it is
    * likely to yield significantly better space and time performance.
    */
  @Deprecated(since="9", forRemoval = true)
  public Integer(int value) {
      this.value = value;
  }
// ...

public void inc(Integer count) {
    for (int i = 0; i < 10; i++) {
        new Thread(() -> {
            synchronized (count) { // 这里会产生编译告警
                count++;
            }
        }).start();
    }
}