public class Solution {

```
public boolean canJump(int[] A) {
if(A.length == 0){
return false;
}
if(A.length == 1){
return true;
}
int last = A.length - 1;
int p = 0;
int jump = 0;
for(int i = 0; i < last; i++){
if(A[i] == 0){
for(int j = i - 1; j >= 0; j--){
jump = Math.max(jump,A[j]+j);
}
if(jump <= i){
return false;
}
}
}
return true;
}
```

}

Because the input is non-negative array, the only way that can prevent this method reaching the last position is there exists a zero element, and the elements before it can not "jump" across the zero element.

So we first find these zero elements, for a particular zero element, use "jump" to represent the longest distance these elements which before the zero one can jump (A[i] + i), if the jump is not bigger than this element's position, then we can conclude that we can't jump over this zero element, so we can't reach the last element.