For instance, my input is
2 // this is variable T
5 2 5 // these are the 3 space separated parameters
1 2 4 5 5 // this is my array
2 3 4 // these are my 2nd set of parameters
2 9 // and my 2nd set of array
package hills;
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class hillJump {
Just the function associated with my program
static void fun(int N, int U, int D, int a[]){
int jump=0,i,para = 1;
for(i=0;i<4;i++){
if((a[i+1]-a[i])==0 || ((a[i+1]-a[i])<=U && (a[i+1]-a[i])>0) || (a[i+1]-a[i])>=D &&(a[i+1]-a[i])<0 ){
jump++;
}
else if(-1*(a[i+1]-a[i])>D && para==1){
para = 0;
jump++;
}
else{
break;
}
}
System.out.println(jump);
}
public static void main(String[] args)throws Exception {
// TODO Auto-generated method stub
I am trying to read the input in the following way,
InputStreamReader r = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(r);
int T = Integer.parseInt(br.readLine());
int arr[][] = new int[T][];
int p[][] = new int[T][]; // N U D
String s,hills;
String str[][] = new String[T][];
String str2[][] = new String[T][];
//reading from keyboard
for(int i=0;i<T;i++){
s = br.readLine();
str[i] = s.trim().split("\\s+");
hills = br.readLine();
str2[i] = hills.trim().split("\\s+");
}
after taking the inputs its showing
**********
Exception in thread "main" java.lang.NullPointerException
at hills.hillJump.main(hillJump.java:50)
**********
//arranging data
for(int i=0;i<T;i++){
for(int j = 0;j<3;i++){
p[i][j] = Integer.parseInt(str[i][j]); // LINE 50 with error
}
for(int j=0;j<str2.length;j++){
arr[i][j] = Integer.parseInt(str2[i][j]);
}
}
//output
for(int i=0;i<T;i++){
fun(p[i][0], p[i][1], p[i][2], arr[i]);
}
}
}
I am stuck and don't know what to do?
I have already gone through the following answers
What is a NullPointerException, and how do I fix it?
still, I am not able to figure out what is the problem. I am using bufferedReader to get the inputs from the same line, and I doubt whether the error is caused by readLine() function.
