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:\""+str1+"\""); else System.out.println("\""+str2+"\"is not in the string:\""+str1+"\"");