밑에 밑에 꺼에 생성자 오버로딩

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class WebDB {     private String name;     private String id;     private String pw;       //이름 관련     public WebDB(){     }     public  WebDB(String a){         this.name=a;                               }       public  WebDB(String a,String b){         this.name=a;         this.id=b;       }         public  WebDB(String a,String b,String c){         this.name=a;         this.id=b;         this.pw=c;     }         void setName(String a)     {         name=a;     }     String getName(String a)     {         setName(a);         return name;     }           //아이디 관련     void setID(String a)     {         id=a;     }     String  getID(String a)     {         setID(a);         return id;     }     // 패스워드 관련     void setPW(String a)     {         pw=a;     }     String  getPW(String a)     {         setPW(a);         return id;     }       //부울형    boolean passOK(String a, String b){        if (pw==a && id==b)        {            return true;          }      else          return false;    }       void memPri()     {        System.out.println(name+"     "+ id+"     "+  pw);     } }   class Members{     public static void main(String [] arg){         WebDB jh= new WebDB("준호","천재","2222") ;         WebDB yjh= new WebDB("이준호","천재") ;         WebDB ljh= new WebDB("이준호") ;         System.out.println(jh.passOK("1234","천재"));         jh.memPri();         yjh.memPri();         ljh.memPri();     } }