2025 最新 Java SE API 中文指南：JDK 全版本类库详解 + 示例代码下载

import java.util.concurrent.ConcurrentHashMap;

public class ConcurrentHashMapExample {
    public static void main(String[] args) {
        ConcurrentHashMap<String, Integer> map = new ConcurrentHashMap<>();
        map.put("key1", );
        map.put("key2", );
        
        map.forEach((key, value) -> {
            System.out.println("键: " + key + ", 值: " + value);
        });
    }
}

import java.util.concurrent.StructuredTaskScope;

public class StructuredConcurrencyExample {
    public static void main(String[] args) throws InterruptedException {
        try (var scope = new StructuredTaskScope.ShutdownOnFailure()) {
            scope.fork(() -> {
                System.out.println("任务 1 执行中...");
                return null;
            });
            
            scope.fork(() -> {
                System.out.println("任务 2 执行中...");
                return null;
            });
            
            scope.join().throwIfFailed();
            System.out.println("所有任务执行完成");
        }
    }
}

import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousFileChannel;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.concurrent.ExecutionException;

public class AsynchronousFileChannelExample {
    public static void main(String[] args) throws InterruptedException, ExecutionException {
        Path path = Paths.get("example.txt");
        try (AsynchronousFileChannel channel = AsynchronousFileChannel.open(path)) {
            ByteBuffer buffer = ByteBuffer.allocate();
            channel.read(buffer, ).get();
            buffer.flip();
            System.out.println(new String(buffer.array()));
        }
    }
}