首先定义一个配置文件config.properties
className=java.util.ArrayList
然后

1. import java.io.FileInputStream;
   
2. import java.io.InputStream;
   
3. import java.util.Collection;
   
4. import java.util.Properties;
   
5. 
   
6. public class ReflectTest2 {
   
7.     public static void main(String[] args) throws Exception {
   
8.         InputStream ips=new FileInputStream("config.properties");
   
9.         Properties prop=new Properties();
   
10.         prop.load(ips);
    
11.         ips.close();
    
12.         String className=prop.getProperty("className");
    
13.         Collection collections=(Collection)Class.forName(className).newInstance();
    
14.         ReflectPoint pt1=new ReflectPoint(3, 3);
    
15.         ReflectPoint pt2=new ReflectPoint(5, 5);
    
16.         ReflectPoint pt3=new ReflectPoint(3, 3);
    
17.         collections.add(pt1);
    
18.         collections.add(pt2);
    
19.         collections.add(pt3);
    
20.         collections.add(pt1);
    
21.         System.out.println(collections.size());
    
22.     }
    
23. }

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首先定义一个配置文件config.properties
className=java.util.ArrayList
然后

1. import java.io.FileInputStream;
   
2. import java.io.InputStream;
   
3. import java.util.Collection;
   
4. import java.util.Properties;
   
5. 
   
6. public class ReflectTest2 {
   
7.     public static void main(String[] args) throws Exception {
   
8.         InputStream ips=new FileInputStream("config.properties");
   
9.         Properties prop=new Properties();
   
10.         prop.load(ips);
    
11.         ips.close();
    
12.         String className=prop.getProperty("className");
    
13.         Collection collections=(Collection)Class.forName(className).newInstance();
    
14.         ReflectPoint pt1=new ReflectPoint(3, 3);
    
15.         ReflectPoint pt2=new ReflectPoint(5, 5);
    
16.         ReflectPoint pt3=new ReflectPoint(3, 3);
    
17.         collections.add(pt1);
    
18.         collections.add(pt2);
    
19.         collections.add(pt3);
    
20.         collections.add(pt1);
    
21.         System.out.println(collections.size());
    
22.     }
    
23. }

复制代码