publicstaticStringgetNumbers(int[]arr,intstart,intend){Stringnumber="";for(inti=start;i<=end;i++){if((""+arr[i]).length()>=2){System.out.println("Let all the numbers be of single digit (Number at position "+i+").");System.exit(1);}number=number+arr[i];}returnnumber;}publicstaticStringgenerateNumbers(int[]arr){if(arr.length<0)System.out.println("Not valid");else{StringphoneNumber="("+getNumbers(arr,0,2)+")"+getNumbers(arr,3,5)+"-"+getNumbers(arr,6,arr.length-1);returnphoneNumber;}return"";}publicstaticvoidmain(String[]args){int[]arr={1,1,1,1,1,1,1,1,1,1};System.out.println(generateNumbers(arr));}
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JAVA