javac错误:"导入x"中的"包x不存在"

Question

我正在尝试使用命令提示符使用以下命令编译我的java文件'check4PrimeTest.java':

javac -classpath.:junit.jar check4PrimeTest.java

我收到以下错误:

错误:包junit.framework不存在import junit.framework.*;

我不知道为什么我得到这个错误,因为我在我的程序中导入了junit.framework.*.

下面是我的代码:

package check4prime;
// check4PrimeTest.java

//Imports 
import junit.framework.*;

public class check4PrimeTest extends TestCase {

    //Initialize a class to work with. 
    private check4Prime check4prime = new check4Prime();

    //constructor 
    public check4PrimeTest (String name) { 
        super(name);
    }

    //Main entry point 
    public static void main(String[] args) {
        System.out.println("Starting test...");
        junit.textui.TestRunner.run(suite());
        System.out.println("Test finished...");
    } // end main() 

    //Test case 1 
    public void testCheckPrime_true() {
        assertTrue(check4prime.primeCheck(3));
    }

    //Test cases 2,3 
    public void testCheckPrime_false() {
        assertFalse(check4prime.primeCheck(0));
        assertFalse(check4prime.primeCheck(1000));
    }

    //Test case 7 
    public void testCheck4Prime_checkArgs_char_input() { 
        try {
            String [] args= new String[1];
            args[0]="r";
            check4prime.checkArgs(args);
            fail("Should raise an Exception.");
        } catch (Exception success) { 
            //successful test
        }
    } //end testCheck4Prime_checkArgs_char_input() 

    //Test case 5 
    public void testCheck4Prime_checkArgs_above_upper_bound() {
        try { 
            String [] args= new String[1];
            args[0]="10001";
            check4prime.checkArgs(args);
            fail("Should raise an Exception.");
        } catch (Exception success) { 
            //successful test
        }
    } // end testCheck4Prime_checkArgs_upper_bound() 

    //Test case 4 
    public void testCheck4Prime_checkArgs_neg_input() {
        try { 
            String [] args= new String[1];
            args[0]="-1";
            check4prime.checkArgs(args);
            fail("Should raise an Exception.");
        } catch (Exception success) { 
            //successful test
        }
    } // end testCheck4Prime_checkArgs_neg_input()

    //Test case 6
    public void testCheck4Prime_checkArgs_2_inputs() {
        try { 
            String [] args= new String[2];
            args[0]="5";
            args[1]="99";
            check4prime.checkArgs(args);
            fail("Should raise an Exception.");
         } catch (Exception success) {
            //successful test 
         } 
    } // end testCheck4Prime_checkArgs_2_inputs 

    //Test case 8 
    public void testCheck4Prime_checkArgs_0_inputs() {
        try { 
            String [] args= new String[0];
            check4prime.checkArgs(args);
            fail("Should raise an Exception.");
        } catch (Exception success) { 
            //successful test
        } 
    } // end testCheck4Prime_checkArgs_0_inputs 

    //JUnit required method. 
    public static Test suite() { 
        TestSuite suite = new TestSuite(check4PrimeTest.class);
        return suite;
    } //end suite() 

} //end check4PrimeTest

Answer 1

您收到此错误是因为您尝试导入包而不告诉系统包所在的位置.以下是告诉您的系统软件包所在位置的说明:

您的javac目标除了源目录和目标目录之外没有指定任何内容 - 它不会添加任何类路径条目; 您需要为相应的JUnit jar文件添加一个条目.有关更多详细信息,请参阅javac任务文档.您可能希望将JUnit的路径指定为类路径属性,嵌套元素或对其他地方声明的路径的引用.

• javac任务文档

来源:在Eclipse中使用Ant运行JUnit测试的问题.初学者问题

prompt> javac -classpath .;$JUNIT_HOME\junit4.x.x.jar test.java

编辑:JUNIT INSTALLATION(从这里):

视窗

要在Windows上安装JUnit,请按照下列步骤操作:

1. Unzip the junit.zip distribution file to a directory referred to as %JUNIT_HOME%.

2. Add JUnit to the classpath (type the following into a command line shell): `set CLASSPATH=%CLASSPATH%;%JUNIT_HOME%\junit.jar`

Unix(bash)

要在Unix上安装JUnit,请按照下列步骤操作:

1. Unzip the junit.zip distribution file to a directory referred to as $JUNIT_HOME.

2. Add JUnit to the classpath (type the following into terminal):

`export CLASSPATH=$CLASSPATH:$JUNIT_HOME/junit.jar`