java动态调用类
package tf;
public class TestPack {
public static void main(String [] args)
{
try
{
IAnimal cAnimal = new bird();
cAnimal.shout();
IAnimal animal =(IAnimal)java.lang.Class.forName("tf.bird").newInstance();
animal.shout();
}
catch (Exception e) {
// TODO: handle exception
}
}
}
//tf.bird 加上包名
//bird.java
package tf;
public class bird implements IAnimal{
public void shout()
{
System.out.println("c c jiji ");
}
}
//IAnimal.java
package tf;
public interface IAnimal {
public void shout();
}
c c jiji
c c jiji
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问题的引入：
问题一：
String str1 = "abc";
String str2 = "abc";
System.out.println(str1==str2); //true
问题二：
String str1 =new String ("abc");
String str2 =new String ("abc");
System.out.println(str1==str2); // false
问题三：
String s1 = "ja";
String s2 = "v ......
