# (Homework Solution): 1.3.27 Write a method maxO that takes a reference to the first node in a linked list

1.3.27 Write a method maxO that takes a reference to the first node in a linked list as argument and returns the value of the maximum key in the list. Assume that all keys are positive integers, and return 0 if the list is empty.

```import java.io.File;
import java.io.FileNotFoundException;
import java.text.DecimalFormat;
import java.util.Arrays;
import java.util.Scanner;
import java.util.Stack;

//This class indicates node
class Node{
Node next;
int val;
Node(int val){
this.val = val;
}

}

class Main{
static int max(Node node){
int ans = 0;
//Iterate through all the nodes in the list
while(node!=null){
//update the maximum value
ans = Math.max(ans,node.val);
node = node.next;
}
return ans;
}
public static void main(String[] args) {
Node a = new Node(5);
Node b = new Node(7);
Node c = new Node(3);
a.next = b;
b.next = c;
System.out.println(max(a));
}
}```

OUTPUT

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