本文整理汇总了Java中java.util.concurrent.ConcurrentHashMap.forEach方法的典型用法代码示例。如果您正苦于以下问题：Java ConcurrentHashMap.forEach方法的具体用法？Java ConcurrentHashMap.forEach怎么用？Java ConcurrentHashMap.forEach使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类java.util.concurrent.ConcurrentHashMap的用法示例。
在下文中一共展示了ConcurrentHashMap.forEach方法的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: testWeakKey
import java.util.concurrent.ConcurrentHashMap; //导入方法依赖的package包/类
/**
* Example using a Cleaner to remove WeakKey references from a Map.
*/
@Test
void testWeakKey() {
ConcurrentHashMap<WeakKey<String>, String> map = new ConcurrentHashMap<>();
Cleaner cleaner = Cleaner.create();
String key = new String("foo"); // ensure it is not interned
String data = "bar";
map.put(new WeakKey<>(key, cleaner, map), data);
WeakKey<String> k2 = new WeakKey<>(key, cleaner, map);
Assert.assertEquals(map.get(k2), data, "value should be found in the map");
key = null;
System.gc();
Assert.assertNotEquals(map.get(k2), data, "value should not be found in the map");
final long CYCLE_MAX = Utils.adjustTimeout(30L);
for (int i = 1; map.size() > 0 && i < CYCLE_MAX; i++) {
map.forEach( (k, v) -> System.out.printf(" k: %s, v: %s%n", k, v));
try {
Thread.sleep(10L);
} catch (InterruptedException ie) {}
}
Assert.assertEquals(map.size(), 0, "Expected map to be empty;");
cleaner = null;
}
示例2: testForEachSequentially
import java.util.concurrent.ConcurrentHashMap; //导入方法依赖的package包/类
/**
* forEachSequentially traverses all mappings
*/
public void testForEachSequentially() {
LongAdder adder = new LongAdder();
ConcurrentHashMap<Long, Long> m = longMap();
m.forEach(Long.MAX_VALUE, (Long x, Long y) -> adder.add(x.longValue() + y.longValue()));
assertEquals(adder.sum(), 3 * SIZE * (SIZE - 1) / 2);
}
示例3: testForEachInParallel
import java.util.concurrent.ConcurrentHashMap; //导入方法依赖的package包/类
/**
* forEachInParallel traverses all mappings
*/
public void testForEachInParallel() {
LongAdder adder = new LongAdder();
ConcurrentHashMap<Long, Long> m = longMap();
m.forEach(1L, (Long x, Long y) -> adder.add(x.longValue() + y.longValue()));
assertEquals(adder.sum(), 3 * SIZE * (SIZE - 1) / 2);
}
示例4: main
import java.util.concurrent.ConcurrentHashMap; //导入方法依赖的package包/类
public static void main(String[] args) {
ConcurrentHashMap<String, ConcurrentLinkedDeque<Operation>> userHash = new ConcurrentHashMap<>();
HashFiller hashFiller = new HashFiller(userHash);
Thread[] threads = new Thread[10];
for (int i = 0; i < 10; i++) {
threads[i] = new Thread(hashFiller);
threads[i].start();
}
for (int i = 0; i < 10; i++) {
try {
threads[i].join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.printf("Size: %d\n", userHash.size());
userHash.forEach(10, (user, list) -> {
System.out.printf("%s: %s: %d\n", Thread.currentThread().getName(), user, list.size());
});
userHash.forEachEntry(10, entry -> {
System.out.printf("%s: %s: %d\n", Thread.currentThread().getName(), entry.getKey(),
entry.getValue().size());
});
Operation op = userHash.search(10, (user, list) -> {
for (Operation operation : list) {
if (operation.getOperation().endsWith("1")) {
return operation;
}
}
return null;
});
System.out.printf("The operation we have found is: %s, %s, %s,\n", op.getUser(), op.getOperation(),
op.getTime());
ConcurrentLinkedDeque<Operation> operations = userHash.search(10, (user, list) -> {
if (list.size() > 10) {
return list;
}
return null;
});
System.out.printf("The user we have found is: %s: %d operations\n", operations.getFirst().getUser(),
operations.size());
int totalSize = userHash.reduce(10, (user, list) -> {
return list.size();
}, (n1, n2) -> {
return n1 + n2;
});
System.out.printf("The total size is: %d\n", totalSize);
}