这是我的代码：
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SeekableByteChannel;
import java.nio.file.Files;
import java.nio.file.InvalidPathException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
public class ExplicitChannelRead {
public static void main(String[] args) {
int count;
Path filePath = null;
// First, obtain a path to a file.
try {
filePath = Paths.get("test1.txt");
}
catch(InvalidPathException e) {
System.out.println("Path error: "+e);
return;
}
// Next, obtain a channel to that file within a try-with-resources block.
try(SeekableByteChannel fChan =
Files.newByteChannel(filePath, StandardOpenOption.CREATE_NEW)) {
// Allocate a buffer.
ByteBuffer mBuf = …这是我的代码：
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
class MyComp implements Comparator<String> {
@Override
public int compare(String o1, String o2) {
return o1.compareTo(o2);
}
}
public class CollectionsAlgo2 {
public static void main(String[] args) {
// Create an ArrayList
ArrayList<String> al = new ArrayList<>();
// Add elements to the array list.
al.add("C");
al.add("A");
al.add("E");
al.add("B");
al.add("D");
al.add("F");
al.add(1, "A2");
System.out.println("al: "+al);
Collections.sort(al);
System.out.println("al after sorting: "+al);
int pos = Collections.binarySearch(al, "B", new MyComp());
System.out.println("pos: "+pos);
}
}
我的问题是在 Collections.binarySearch(List<? extends T> …