填空题

本题是判断一个字符串“Tom”是否在另外一个字符串“I am Tom, I am from China”中出现。
public class java1
public static void main(String[] args)
______;
str1="I am Tom, I am from China.";
str2= "Tom";
int i=______;
if(______)
System. out. println("\" "+str2+"\" is in the string:\" "+strl+"\"");
else
System. out. println("\" "+str2+"\" is not in the string:\" "+strl+"\"");