java - 当 Netbeans 正确运行同一程序时，无法从 CLI 运行 java 程序

Question

以下程序在 Netbeans IDE 中运行良好，但是当我尝试从命令提示符运行时，我得到了

Exception in thread "main" java.lang.NoClassDefFoundError: Gcd (wrong name: algo
rithms/Gcd)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$100(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)

package algorithms;

public class Gcd {

public static int ComputeGcd(int number1, int number2){
    if(number2 == 0){ return number1;}
    else{
         int remainder = number1 % number2;
         return ComputeGcd(number2,remainder);
    }
}


public static void main(String[] args) {

    int a = 32;
    int b = 12;
    System.out.println(ComputeGcd(a,b));

} 

}

Answer 1

您应该在 src 目录中运行以下命令:

...\src> javac algorithms\Gcd.java
...\src> java algorithms.Gcd

(您不必从该目录进行编译，但我建议您这样做。)

java 命令采用完全限定的类名称，其中包括包名称。