java错误: Could not find or load main class BinarySearch

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这个问题已经有答案了:

What does "Could not find or load main class" mean? (62 个回答)

已关闭 3 年前。

我正在阅读 Sedgewick 的《算法》(第四版)。代码是这样的:

package edu.princeton.cs.algs4;

import java.util.Arrays;

/**
 *  The {@code BinarySearch} class provides a static method for binary
 *  searching for an integer in a sorted array of integers.
 *  <p>
 *  The <em>indexOf</em> operations takes logarithmic time in the worst case.
 *  <p>
 *  For additional documentation, see <a href="https://algs4.cs.princeton.edu/11model">Section 1.1</a> of
 *  <i>Algorithms, 4th Edition</i> by Robert Sedgewick and Kevin Wayne.
 *
 *  @author Robert Sedgewick
 *  @author Kevin Wayne
 */
public class BinarySearch {

    private BinarySearch() { }
    public static int indexOf(int[] a, int key) {
        int lo = 0;
        int hi = a.length - 1;
        while (lo <= hi) {
            // Key is in a[lo..hi] or not present.
            int mid = lo + (hi - lo) / 2;
            if      (key < a[mid]) hi = mid - 1;
            else if (key > a[mid]) lo = mid + 1;
            else return mid;
        }
        return -1;
    }

    @Deprecated
    public static int rank(int key, int[] a) {
        return indexOf(a, key);
    }

    public static void main(String[] args) {

        // read the integers from a file
        In in = new In(args[0]);
        int[] whitelist = in.readAllInts();

        // sort the array
        Arrays.sort(whitelist);

        // read integer key from standard input; print if not in whitelist
        while (!StdIn.isEmpty()) {
            int key = StdIn.readInt();
            if (BinarySearch.indexOf(whitelist, key) == -1)
                StdOut.println(key);
        }
    }
}

我已经成功编译了代码:

javac -cp /Users/user/documents/algorithms/algs4-master/target/algs4-1.0.0.0.jar BinarySearch.java

但是当我尝试运行代码时，发生错误:

user$ java -cp /Users/user/documents/algorithms/algs4-master/target/algs4-1.0.0.0.jar BinarySearch Error: Could not find or load main class BinarySearch Caused by: java.lang.ClassNotFoundException: BinarySearch

请帮忙告诉我这里发生了什么。非常感谢!

Answer 1

提供 main 方法所在类的整个包，并且不带 .java，因为您正在运行该类，而不是 java 文件:

edu.princeton.cs.algs4

javac -cp /Users/user/documents/algorithms/algs4-master/target/algs4-1.0.0.0.jar edu.princeton.cs.algs4.BinarySearch