в 17:44, 31 мая 2010

2010-05-31T17:44:26Z

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2010-05-31T15:19:36Z

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== Get full class name ==



<source lang="java">
public class Main {
public static String getFullClassName(Class c) {
return c.getName();
}

public static void main(String[] args) {
System.out.println(getFullClassName(java.awt.Frame.class));
}
}</source>



== Get the class name in a static method ==



<source lang="java">
public class Main{
public static void main(java.lang.String[] args) {
System.out.println("in " + new CurrentClassGetter().getClassName() + " class");
}
}
class CurrentClassGetter extends SecurityManager {
public String getClassName() {
return getClassContext()[1].getName();
}
}</source>



== Get the fully-qualified name of a class ==



<source lang="java">
public class Main {
public static void main(String[] argv) throws Exception {
Class cls = java.lang.String.class;
String name = cls.getName();
System.out.println(name);
}
}</source>



== Get the fully-qualified name of a inner class ==



<source lang="java">
public class Main {
public static void main(String[] argv) throws Exception {
Class cls = java.util.Map.Entry.class;
String name = cls.getName();
System.out.println(name);
}
}</source>



== Get the name of a class ==



<source lang="java">
import java.util.Calendar;
import java.math.BigDecimal;
public class Main {
public static void main(String[] args) {
// Get the name of the classes below.
Class clazz = String.class;
System.out.println("Class Name: " + clazz.getName());
clazz = Calendar.class;
System.out.println("Class Name: " + clazz.getName());
clazz = BigDecimal.class;
System.out.println("Class Name: " + clazz.getName());
}
}</source>



== Get the name of an array ==



<source lang="java">
public class Main {
public static void main(String[] argv) throws Exception {
String name = boolean[].class.getName();
System.out.println(name);
name = byte[].class.getName();
System.out.println(name);
name = char[].class.getName();
System.out.println(name);
name = short[].class.getName();
System.out.println(name);
name = int[].class.getName();
System.out.println(name);
name = long[].class.getName();
System.out.println(name);
name = float[].class.getName();
System.out.println(name);
name = double[].class.getName();
System.out.println(name);
name = String[].class.getName();
System.out.println(name);
name = int[][].class.getName();
System.out.println(name);
}
}</source>



== Get the name of void ==



<source lang="java">
public class Main {
public static void main(String[] argv) throws Exception {
Class cls = Void.TYPE;
String name = cls.getName(); // void
}
}</source>



== Get the unqualified name of a class ==



<source lang="java">
public class Main {
public static void main(String[] argv) throws Exception {
Class cls = java.util.Map.Entry.class;
String name = cls.getName();
if (name.lastIndexOf(".") > 0) {
name = name.substring(name.lastIndexOf(".") + 1); // Map$Entry
name = name.replace("$", "."); // Map.Entry
}
}
}</source>



== Getting the Name of a Member Object ==



<source lang="java">
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
public class Main {
public static void main(String[] argv) throws Exception {
Class cls = java.lang.String.class;
Method method = cls.getMethods()[0];
Field field = cls.getFields()[0];
Constructor constructor = cls.getConstructors()[0];
String name;
name = cls.getName();
System.out.println(name);
name = cls.getName() + "." + field.getName();
System.out.println(name);
name = constructor.getName();
System.out.println(name);
name = cls.getName() + "." + method.getName();
System.out.println(name);
}
}
/*
java.lang.String
java.lang.String.CASE_INSENSITIVE_ORDER
java.lang.String
java.lang.String.hashCode
*/</source>



== Unqualified names ==



<source lang="java">
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
public class Main {
public static void main(String[] argv) throws Exception {
Class cls = java.lang.String.class;
Method method = cls.getMethods()[0];
Field field = cls.getFields()[0];
Constructor constructor = cls.getConstructors()[0];
String name;
name = cls.getName().substring(cls.getPackage().getName().length()+1);
System.out.println(name);
name = field.getName();
System.out.println(name);
name = constructor.getName().substring(cls.getPackage().getName().length()+1);
System.out.println(name);
name = method.getName();
System.out.println(name);
}
}
/*String
CASE_INSENSITIVE_ORDER
String
hashCode
*/</source>



== Use Class.forName to load a class ==



<source lang="java">
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
public class Main{
public static void main(String args[]) throws Exception {
Class c = Class.forName("MyClass");
}
}
class MyClass {
private int count;
MyClass(int c) {
count = c;
}
MyClass() {
count = 0;
}
void setCount(int c) {
count = c;
}
int getCount() {
return count;
}
void showcount() {
System.out.println("count is " + count);
}
}</source>

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в 17:44, 31 мая 2010

Admin: 1 версия