Urgent!!! Problem on the String method and File method

I would like to ask two questions:
(1) From the String method, it can use .equals() method to compare two strings whether two string exactly equal or not. But what method can i use to compare two strings see whether any words exists in the string?
(2) From the following code,
Java.io.File outFile = new java.io.File("TestProg.java");If i would like to use a variable (e.g. let the variable be name) instead of the filename "TestProg.java", do you know how to revise the above code??
If i write as following, is it correct???
Java.io.File outFile = new java.io.File(""+name+"");Please help!!!

1- To check whether a word (sunstring) exists in a longer string, you can use the following String method:
indexOf(substring) on the string that you are searching. If the word does not exist, -1 is returned.
2- yes you can provide a variable (of type string) in the constrcutor of File.

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