배열 연습

StudentRunner.java

package com.arrays;

import java.math.BigDecimal;

public class StudentRunner {
	public static void main(String[] args) {
		int[] marks = {99, 98, 100};
		
		Student student = new Student("BAEK", marks);
		
		int number = student.getNumberOfMarks();
		
		int sum = student.getTotalSumOfMarks();
		System.out.println("sum:" + sum);
		
		int maximumMark = student.getMaximumMark();
		System.out.println("maximumMark:" + maximumMark);
		
		int minimumMark = student.getMinimumMark();
		System.out.println("minimumMark:" + minimumMark);
		
		BigDecimal average = student.getAverageMarks();
		System.out.println("average:" + average);
	}
}

Student.java

package com.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 i = 0; i < marks.length; i++) {
			sum += marks[i];
		}

		return sum;
	}

	public int getMaximumMark() {
		int maximum = Integer.MIN_VALUE;
		for (int mark : marks) {
			if (mark > maximum) {
				maximum = mark;
			}
		}

		return maximum;
	}

	public int getMinimumMark() {
		int minimum = Integer.MAX_VALUE;
		
		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);
	}

}