Mega Code Archive
Using reflection to show all the methods of a class
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// : c10:ShowMethods.java
// Using reflection to show all the methods of a class,
// even if the methods are defined in the base class.
// {Args: ShowMethods}
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.regex.Pattern;
public class ShowMethods {
private static final String usage = "usage: \n"
+ "ShowMethods qualified.class.name\n"
+ "To show all methods in class or: \n"
+ "ShowMethods qualified.class.name word\n"
+ "To search for methods involving 'word'";
private static Pattern p = Pattern.compile("\\w+\\.");
public static void main(String[] args) {
if (args.length < 1) {
System.out.println(usage);
System.exit(0);
}
int lines = 0;
try {
Class c = Class.forName(args[0]);
Method[] m = c.getMethods();
Constructor[] ctor = c.getConstructors();
if (args.length == 1) {
for (int i = 0; i < m.length; i++)
System.out.println(p.matcher(m[i].toString())
.replaceAll(""));
for (int i = 0; i < ctor.length; i++)
System.out.println(p.matcher(ctor[i].toString())
.replaceAll(""));
lines = m.length + ctor.length;
} else {
for (int i = 0; i < m.length; i++)
if (m[i].toString().indexOf(args[1]) != -1) {
System.out.println(p.matcher(m[i].toString())
.replaceAll(""));
lines++;
}
for (int i = 0; i < ctor.length; i++)
if (ctor[i].toString().indexOf(args[1]) != -1) {
System.out.println(p.matcher(ctor[i].toString())
.replaceAll(""));
lines++;
}
}
} catch (ClassNotFoundException e) {
System.out.println("No such class: " + e);
}
}
} ///:~
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