对clazz.getResource("")的困惑，请朋友们解惑，多谢

package test;public class A {}

package test;public class Main {    public static void println(Class clazz) {        System.out.println("=====" + clazz.getName() + "=====");        try {            System.out.println("1 " + clazz.getResource(""));        } catch (Exception e) {            System.out.println("1 error " + e.getMessage());        }        try {            System.out.println("2 " + clazz.getResource("/"));        } catch (Exception e) {            System.out.println("2 error " + e.getMessage());        }        try {            System.out.println("3 " + clazz.getClassLoader().getResource(""));        } catch (Exception e) {            System.out.println("3 error " + e.getMessage());        }        System.out.println("4 " + clazz.getResource("test.txt"));    }    public static void main(String[] args) {        println(Main.class);        try {            println(Class.forName("test.A"));        } catch (ClassNotFoundException e) {            System.out.println("ClassNotFound " + e.getMessage());        } catch (Exception e) {            e.printStackTrace();        }        try {            println(Class.forName("oracle.jdbc.driver.OracleDriver"));        } catch (ClassNotFoundException e) {            System.out.println("ClassNotFound" + e.getMessage());        } catch (Exception e) {            e.printStackTrace();        }    }}

@set CLASSPATH=.;%CLASSPATH%;cl1.jar;ojdbc14_g.jar;@ECHO java -jar cl2.jar调用**************************************************@java -jar cl2.jar@ECHO 将cl2.jar添加到CLASSPATH中@set CLASSPATH=.;%CLASSPATH%;cl2.jar;@ECHO java test.Main调用**************************************************@java test.Mainpause