java - IntelliJ does not generate Copy Constructor -

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i try automatically generate copy constructor intellij, can not select due box grey out. how automatically generate copy constructor intellij?

my java class

public class parameter {     public double ma;     public double mb;     public double mc;     public double md;     public string mpath;      public parameter(double ma, double mb, double mc, double md, string mpath) {         super();         this.ma = ma;         this.mb = mb;         this.mc = mc;         this.md = md;         this.mpath = mpath;     }      public parameter(double ma, double mb, double mc, double md) {         this(ma, mb, mc, md, "");     }      public double geta() {         return ma;     }     public double getb() {         return mb;     }     public double getc() {         return mc;     }     public double getd() {         return md;     }     public string getpath(){         return mpath;     } }

the button grey out.

enter image description here

generating copy constructor functionality not built intellij idea. perhaps generate copy constructor action coming plugin?


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