静态方法和泛型

   
   
  
  
 
   
 
    
 
     
 
    
 
    
 
     
 
      public 
      class ResponseBean<T> { 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      private int code; 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      private String message; 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      private String lang; 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      private String accessToken; 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      private String sign; 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      private int source; 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      private Date time; 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      private T value; 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      public ResponseBean() { 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     

       } 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      private ResponseBean(int code, T value) { 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      this(code, value, 
      ""); 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     

       } 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      private ResponseBean(int code, T value, String message) { 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      this.time = new Date(); 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      this.lang = 
      "zh_Cn"; 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      this.source = 
      201; 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      this.code = code; 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      this.value = value; 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      this.message = message; 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     

       } 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      private ResponseBean(int code, String message) { 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      this.time = new Date(); 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      this.lang = 
      "zh_Cn"; 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      this.source = 
      201; 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      this.code = code; 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      this.message = message; 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     

       } 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      public static <T> ResponseBean<T> error(String msg, T 
      data) { 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
      return new ResponseBean<>( 
      200, 
      data, msg); 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     

       } 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     
 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     

       省略 
      get（） 
      set()方法 
     
 
    
 
   
 
    
 
     
 
    
 
    
 
     

       } 
     
 
    
 
  
  
  
 
 

静态方法不能访问类中定义的泛型，如果静态方法中数据类型不确定，可以在方法上定义泛型。

即上例中<T>就是声名一个泛型T，之后两个T是在使用泛型T。

原文地址：https://blog.csdn.net/m18870420619/article/details/79929316