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1
56
57
59 import java.net.URL  ;
60
61 class WhichClass {
62 public static void main(String [] args) {
63 String targetClass = null;
64 if (args.length == 1) {
65 targetClass = args[0];
66 }
67 else {
68 printUsage();
69 return;
70 }
71
72 try {
73 Class.forName(targetClass);
74 System.out.println("Found class '" + targetClass + "'");
75 }
76 catch (ClassNotFoundException ex){
77 System.out.println("Failed to find class '" + targetClass + "'");
78 }
79
80 URL u = ClassLoader.getSystemResource(toPath(targetClass));
81 if (u != null) {
82 System.out.println("at URL '" + u + "'");
83 }
84 }
85
86 private static String toPath(String className){
87 StringBuffer sb = new StringBuffer (className);
88 for (int i=0; i < sb.length(); i++) {
89 if (sb.charAt(i) == '.') {
90 sb.setCharAt(i, '/');
91 }
92 }
93 sb.append(".class");
94 return sb.toString();
95 }
96
97 private static void printUsage() {
98 System.out.println("This program reports the location of a class file.");
99 System.out.println("Usage: java WhichClass classname");
100 }
101 }
102
103 |
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Java API By Example, From Geeks To Geeks.