＆lt; T＆gt; Generic method demonstration

The method you use , Make a note of .( The code is typed by hand , There are mistakes , Please forgive me )

Method ： Assign values to properties in the object

// Set object property values , Returns the object 
public <T> T saveValue(T t,String name,String value){
    // Class<? extends Object> c = t.getClass();
    // Get the property -- Specific one 
    Field field = t.getClass().getDeclaredField(name);
    /*
         You can also get all attributes ,for loop 
        Field []  fields = t.getClass().getDeclaredFields();
        for...// Omit 
    */
    // This property must be set to true, If the object property is private private . Must be set , Otherwise, we can't get the value 
    field.setAccessible(true);
    // take t Medium Field Is set to value
    field.set(t,value);
    return t;

}

Method ： Get the value of one of the generic attributes

// Get the object attribute value , Return property value 
public <T> Object saveValue(T t,String name){
    // Get the property -- Specific one 
    Field field = t.getClass().getDeclaredField(name);
    // This property must be set to true, If the object property is private private . Must be set , Otherwise, we can't get the value 
    field.setAccessible(true);
    return field.get(t);
}

Method ： iterator

// Own diary ,--jsonarray yes list object ,it You can iterate like this 
for(Iterator it = JsonArray.iterator();it.hasNext();){
    String jj = (String)it.next();

}

Method ：json Transfer object

//user As object ,obj by JSONObject
User user = new ObjectMapper().readValue(obj.toString(),User.class);