覆盖tostring（）方法并传递对象引用而不获取哈希

Question

我试图覆盖toString()方法并打印不包含哈希值。 当我尝试打印时使用tostring()方法时，它要求我创建另一个对象，例如asset server = new asset(); 。 当我这样做并仅使用server它将返回默认构造函数，或者当我使用server[i]时给出错误。 我写的代码返回以下内容：

 `ant -f C:\\Users\\kalle\\Documents\\NetBeansProjects\\assign7 -
  Dnb.internal.action.name=run run
  init:
  Deleting: C:\Users\kalle\Documents\NetBeansProjects\assign7\build\built-
  jar.properties
  deps-jar:
  Updating property file: 
  C:\Users\kalle\Documents\NetBeansProjects\assign7\build\built-
  jar.properties
  compile:
  run:
  server switch etc.
  0
  vendor model number
  serial number
  1

  driver.asset@15db9742
  server
  server0
  10
  a1
  1
   driver.asset@15db9742
   server
  server1
  20
  a2
  1
  BUILD SUCCESSFUL (total time: 0 seconds)`

这是我的代码：

 package driver;

public class Driver {

    public static void main(String[] args) {
        int i;
        asset basic = new asset();
        asset[] server = new asset[2];
        server[0]= new asset("server", 10, "server0", "a1", 1);
        server[1]= new asset("server", 20, "server1", "a2",1);
        for (i=0;i<server.length;i++){
            System.out.println(basic);
            System.out.println(server[i].Type);
            System.out.println(server[i].Name);
            System.out.println(server[i].ID);
            System.out.println(server[i].Serial);
            System.out.println(server[i].PID);
        }
    }
}

public class asset {
    String Type;
    int ID;
    String Name;
    String Serial;
    int PID;
    int i;

    public String getType(){
        return Type;
    }

    public void setType(String Type){
        this.Type = Type;
    }

    public int getID(){ 
        return ID;
    }

    public void setID(int getid){
        Integer.toString(ID);
        this.ID= ID;
    }

    public String getName(){
        return Name;
    }

     public void setName(String Name){
         this.Name = Name;
     }

     public String getSerial(){
         return Serial;
     }

    public void setSerial(String Serial){
        this.Serial = Serial;
    }

    public int getPID() {        
        return PID;    
    }

    public void setPID(int getPID) {
        Integer.toString(PID);
        this.PID= PID;     
    }

    public asset(){
        Name ="vendor model number";
        ID =0;
        Serial ="serial number";
        Type ="server switch etc.";
        PID =1;
        System.out.println( Type + "\n " + ID + "\n " + Name + "\n " + Serial + "\n " + PID + "\n ");}

        asset(String Type, int ID, String Name, String Serial, int PID){
        this.Type= Type;
        this.Name= Name;
        this.PID= PID;
        this.Serial= Serial;
        this.ID= ID;        
    }

    public String toString (asset[] a){
        getType();
        getID();
        setID(ID);
        getName();
        getSerial();
        getPID();
        setPID(PID);

       return this.Type + " " + this.ID + " " + this.Name + " " + this.Serial + " " + this.PID + " ";
    }
}

我如何摆脱“ driver.asset@15db9742”。

Answer 1

覆盖toString方法的正确方法是具有以下结构：

public String toString(){
    // return String type
}

为您服务（调用getXY()不会单独执行任何操作）：

public String toString (){  
   return this.Type + " " + this.ID + " " + this.Name + " " + this.Serial + " " + this.PID + " ";
}

---

另外，为了遵循约定，您最好：

• CamelCase中的名称类： asset -> Asset
• 名称属性（＆parameter＆variables）遵循camelCase ： type ， id ， name ， pid

Answer 2

尝试这个：

int i;
asset basic = new asset();
asset[] server = new asset[2];
server[0]= new asset("server", 10, "server0", "a1", 1);
server[1]= new asset("server", 20, "server1", "a2",1);
System.out.println(basic); // just delete this line.
for (i=0;i<server.length;i++)
{
System.out.println(server[i].Type);
System.out.println(server[i].Name);
System.out.println(server[i].ID);
System.out.println(server[i].Serial);
System.out.println(server[i].PID);}

}

您一直在打印出basic的值，这可能就是为什么它选择了字符串哈希名称而不是实际存储的值的原因。 只需采用System.out.println（basic）; 退出for循环？ 更好的是，完全删除该行！