javaLP(Multi), Java

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//'main' method must be in a class 'Rextester'.
//openjdk version '11.0.5'

////////////////////////////////////////////////////////////////////////////////javaLP(Multi):Linear probing using multiplication method in java
//this code is  created by Rezaul Hoque on September 19,2022;
//contact:jewelmrh@yahoo.com;Dhaka,Bangladesh;https://rezaulhoque.wordpress.com,https://hoquestake.blogspot.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;
//////////////////////////////////////////////////////////////////////////////
import java.util.*;
import java.lang.*;
class Demo{
int[] k=null;
int[] a=null;

public Demo(){
}
public Demo(int[] e,int[] r){
 this.k=e;
this.a=r;
 
}

public double fmod(double a,double b){

int res=(int)Math.floor(a/b);
return a-res*b;
}
public void Hash(){
int[] tab=new int[7];
int[] val=new int[7];
for(int i=0;i<7;i++)
{
tab[i]=-1;
val[i]=-1;
}

for(int i=0;i<7;i++){
int h=(int)Math.floor(7*fmod(k[i]*0.618,1));
if(tab[h]==-1){
tab[h]=k[i];
val[h]=a[i];
}
else{
for(int j=0;j<7;j++){
int q=(h+j)%7;
if(tab[q]==-1){
tab[q]=k[j];
val[q]=a[j];
break;
       }
      }
     }
   }

System.out.println("Index   Value");
System.out.println("---------------------");
for(int m=0;m<7;m++){

System.out.printf("%d\t%d\n",tab[m],val[m]);
      
    }
  }
}
class Rextester
{  
    public static void main(String args[])
    {
int[] x=new int[]{10,14,8,15,19,1,21};
  int[] y=new int[]{30,41,45,19,15,5,3};
  Demo s=new Demo(x,y);
      s.Hash();
    }
}

[ + ] Show input
Compilation time: 0.51 sec, absolute running time: 0.2 sec, cpu time: 0.13 sec, memory peak: 36 Mb, absolute service time: 0,82 sec