Program in java to find a String in a sentence

Hi all
I am writing a program to find whether a particular word exists in a sentence or not .

public class SB {  public static void main(String[] args) {   String test="Hi I am here";   String find="am";       if(test.indexOf(find)>0)     {      System.out.println("found ");     }     else     {      System.out.println("not found");     }  } }

output: found

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public class SB {  public static void main(String[] args) {   String test="Hi I am here";   String find="kill";       if(test.indexOf(find)>0)     {      System.out.println("found am");     }     else     {      System.out.println("not found");     }  } }

output : not found