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1.´Óµ±Ç°µÄ¹¤×÷Ŀ¼ÖжÁÈ¡:
        try {
            BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream("wkdir.txt")));
            String str;
            while ((str = in.readLine()) != null) {
                System.out.println(str);
            }
            in.close();
        } catch (IOException e) {
        }
2,´ÓclasspathÖжÁÈ¡(¶ÁÈ¡ÕÒµ½µÄµÚÒ»¸ö·ûºÏÃû³ÆµÄÎļþ):
        try {
            InputStream stream = ClassLoader.getSystemResourceAsStream("fileinjar.txt");
            BufferedReader in = new BufferedReader(new InputStreamReader(stream));
            String str;
            while ((str = in.readLine()) != null) {
                System.out.println(str);
            }
            in.close();
        } catch (IOException e) {
        }
3,´ÓclasspathÖжÁÈ¡(¶ÁÈ¡ÕÒµ½µÄËùÓзûºÏÃû³ÆµÄÎļþ,ÈçSpringÖдøÓÐclasspath*:ǰ׺µÄÇé¿ö¾Í»á´ÓclasspathÖбéÀú):
        try {
            Enumeration resourceUrls = Thread.currentThread().get


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class SuperClass {
private int n;

SuperClass() {
System.out.println("SuperClass()");
}

SuperClass(int n) {
System.out.println("SuperClass(" + n + ")");
this.n = n;
}
}
class SubClass extends SuperClass {
private int n ......
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