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Database System Concepts
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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THE SECOND JAVA PROGRAM Write a multithreading program that searches for a prime number in a two-dimensional array. Once a prime number is found the search process must stop and all child threads must be cancelled. If a prime number is found, the main thread must then display the number and its location (the row and column numbers where it was found); otherwise the program should display the message "no primes were found". Recall that a prime number is only divisible by 1 and itself (e.g. 1, 2,5, 7, 11, 13). Hints: 1) To calculate the execution time of the program you can use the System.currentTimeMillis() to obtain the current time before and after the execution of the algorithm and subtract the earlier time from the latter to get the total execution time 2) You can use thread.interrupt(); to stop a thread; you will need this in the second program to stop all running threads once a thread finds a prime number.
Transcribed Image Text:THE SECOND JAVA PROGRAM Write a multithreading program that searches for a prime number in a two-dimensional array. Once a prime number is found the search process must stop and all child threads must be cancelled. If a prime number is found, the main thread must then display the number and its location (the row and column numbers where it was found); otherwise the program should display the message "no primes were found". Recall that a prime number is only divisible by 1 and itself (e.g. 1, 2,5, 7, 11, 13). Hints: 1) To calculate the execution time of the program you can use the System.currentTimeMillis() to obtain the current time before and after the execution of the algorithm and subtract the earlier time from the latter to get the total execution time 2) You can use thread.interrupt(); to stop a thread; you will need this in the second program to stop all running threads once a thread finds a prime number.
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