02-after-string-array.md

Complete Code Example

/src/com/in28minutes/arrays/StringRunner.java

package com.in28minutes.arrays;

public class StringRunner {

	public static void main(String[] args) {

		String[] daysOfWeek = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };

		String dayWithMostCharacters = "";

		for (String day : daysOfWeek) {
			if (day.length() > dayWithMostCharacters.length()) {
				dayWithMostCharacters = day;
			}
		}

		System.out.println("Day with Most number of characters " + dayWithMostCharacters);

		for (int i = daysOfWeek.length - 1; i >= 0; i--) {
			System.out.println(daysOfWeek[i]);
		}

	}

}

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/src/com/in28minutes/arrays/Student.java

package com.in28minutes.arrays;

import java.math.BigDecimal;
import java.math.RoundingMode;

public class Student {

	private String name;
	private int[] marks;

	public Student(String name, int... marks) {
		this.name = name;
		this.marks = marks;
	}

	public int getNumberOfMarks() {
		return marks.length;
	}

	public int getTotalSumOfMarks() {
		int sum = 0;
		for (int mark : marks) {
			sum += mark;
		}
		return sum;
	}

	public int getMaximumMark() {
		int maximum = Integer.MIN_VALUE; // 95, 98, 10
		for (int mark : marks) {
			if (mark > maximum) {
				maximum = mark;
			}
		}
		return maximum;
	}

	public int getMinimumMark() {
		int minimum = Integer.MAX_VALUE; // 95, 98, 10
		for (int mark : marks) {
			if (mark < minimum) {
				minimum = mark;
			}
		}
		return minimum;
	}

	public BigDecimal getAverageMarks() {
		int sum = getTotalSumOfMarks();
		int number = getNumberOfMarks();

		return new BigDecimal(sum).divide(new BigDecimal(number), 3, RoundingMode.UP);
	}

}

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/src/com/in28minutes/arrays/StudentRunner.java

package com.in28minutes.arrays;

import java.math.BigDecimal;

public class StudentRunner {

	public static void main(String[] args) {
				
		Student student = new Student("Ranga", 97, 98, 100);
				
		int number = student.getNumberOfMarks();
		System.out.println("number of marks : " + number);
		
		int sum = student.getTotalSumOfMarks();
		System.out.println("sum of marks : " + sum);
		
		int maximumMark = student.getMaximumMark();
		System.out.println("maximum of marks : " + maximumMark);
		
		int minimumMark = student.getMinimumMark();
		System.out.println("minimum of marks : " + minimumMark);
		
		BigDecimal average = student.getAverageMarks();
		System.out.println("average : " + average);
		
		//student.addNewMark(35);

		//student.removeMarkAtIndex(5);

	}

}

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