4. Given the following String source = "12dcxvlobcQakijkflobcPQ987"; use the String methods indexOf, substring, and lastindexOf (together with any other Java code except charAt) to: a. Write Java code to count how many times a specific String str appears in source. For example, how many times lob appears. Write generic code for String str, not lob. b. Write Java code to extract a String search from the String source. For example, extract the string Qak. Write generic code for search, not Qak.

4. Given the following String source = "12dcxvlobcQakijkflobcPQ987"; use the String methods indexOf, substring, and lastindexOf (together with any other Java code except charAt) to: a. Write Java code to count how many times a specific String str appears in source. For example, how many times lob appears. Write generic code for String str, not lob. b. Write Java code to extract a String search from the String source. For example, extract the string Qak. Write generic code for search, not Qak.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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