In this session, you will learn: 1. Practice session 2. Object-Oriented Programming (OOPs) Concepts

1. Java & JEE Training
Day 6 – Practice Session

2. Practice Problems

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Agenda
• Practice session
• Object Oriented Programming (OOPs) Concepts

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Nested for loops
• A loop placed inside another loop.
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= 10; j++) {
System.out.print("*");
}
System.out.println(); // to end the line
}
• Output:
**********
**********
**********
**********
**********
• The outer loop repeats 5 times; the inner one 10 times.
• "sets and reps" exercise analogy

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What is the output?

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What is the output?

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What is the output?

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What is the output?

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What is the output?

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What is the output?
• Infinite Loop

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What is the output?

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What is the output?
• Infinite Loop

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Generating Complex Line Outputs…
• What nested for loops produce the following output?
• We must build multiple complex lines of output using:
• an outer "vertical" loop for each of the lines
• inner "horizontal" loop(s) for the patterns within each line

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Outer and Inner Loop
• First write the outer loop, from 1 to the number of lines.
• Now look at the line contents. Each line has a pattern:
• some dots (0 dots on the last line), then a number
• Observation: the number of dots is related to the line number.

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Mapping loops to numbers
• What statement in the body would cause the loop to print:
4 7 10 13 16

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Mapping loops to numbers
• What statement in the body would cause the loop to print:
4 7 10 13 16

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Loop tables
• What statement in the body would cause the loop to print:
2 7 12 17 22
• To see patterns, make a table of count and the numbers.
– Each time count goes up by 1, the number should go up by 5.
– But count * 5 is too great by 3, so we subtract 3.

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Nested for loop exercise
• Make a table to represent any patterns on each line.

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What is the output?

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What is the output?

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Write a program to…

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Solution

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Topics to be covered in next session
• Object Oriented Concepts
• Introduction to OO Analysis and Design

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Thank You!