Test.java

package co.miaki.nahid;

import java.util.ArrayList;

public class Test {
	public static void main(String[] args){
		float[] studentCGPAFromArray  = new float[1000];
		float[] studentCGPAFromArrayList = new float[1000];
		int i = 0;
		for(float studentCGPA : getStudentCGPAAsArray()){
			// Type Casting is not required since Array is type safe.
			studentCGPAFromArray[i++] = studentCGPA;
		}
		i = 0;
		for(Object studentCGPAObject : getStudentCGPAAsArrayList()){
			// Type Casting is required since ArrayList will return Object type.
			// No error at compile time.
			// Error at runtime since it will get objects other than Float
			studentCGPAFromArrayList[i++] = (float)studentCGPAObject;
		}
		
	}
	// Return student CGPA as ArrayList
	public static ArrayList getStudentCGPAAsArrayList(){
		ArrayList studentCGPA = new ArrayList();
		studentCGPA.add(2.4f);
		// No Compile time error since, we can add any type of variable rin ArrayList
		studentCGPA.add("2.3");
		studentCGPA.add("anything");
		return studentCGPA;
	}
	// Return student CGPA as Array
	public static float[] getStudentCGPAAsArray(){
		float[] studentCGPA = new float[1000];
		studentCGPA[0] = 2.3f;
		// Compile time error, since we are trying to add string in float type					
		studentCGPA[1] = "2.3";
		return studentCGPA;
	}
}