NUMBER 1

//Declare
		String [] keys;

		//Instantiate or Allocate memory
		keys = new String [3];

		keys[0] = "Technological Institute";
		keys[1] = "of the Philippines";
		keys[2] = "Quezon City";

		System.out.println("Array element: " + keys[0]);
		System.out.println("Array element: " + keys[1]);
		System.out.println("Array element: " + keys[2]);

	}

}

NUMBER 2

import javax.swing.JOptionPane;

public class _2_ArrayClass2Exercise {

	public static void main(String[] args) {
		int arraySize;

		arraySize = Integer.parseInt(JOptionPane.showInputDialog("Enter array size: "));

		String [] keys = new String [arraySize];

		for (int counter = 0; counter < keys.length; counter++) {

		}
		for (int counter = 0; counter < keys.length; counter++) {
			keys [counter] = JOptionPane.showInputDialog("Enter elements in String: ");
		}
		for (int counter = 0; counter < keys.length; counter++) {
			JOptionPane.showMessageDialog(null, keys[counter]);
		}

	}

}

NUMBER 3

public class _3_ArrayClass3Exercise {

	byte arraySize;
	String keys;

	//Constructor
	public _3_ArrayClass3Exercise(byte arraySize) {
		this.keys = keys;
	}

	public _3_ArrayClass3Exercise(String keys) {
		this.keys = keys;
	}

	public void setArraySize(byte arraySize) {
		this.arraySize = arraySize;
	}

	public String getKeys() {
		return keys;
	}

	public void setKeys(String keys) {
		this.keys = keys;
	}

	public byte getArraySize() {
		return arraySize;
	}

}

NUMBER 4

import javax.swing.*;

public class _4_ArrayClass4RunnerExercise {

	public static void main(String[] args) {

		byte arraySize;
        arraySize = Byte.parseByte(JOptionPane.showInputDialog ("Enter array Size: "));

        _3_ArrayClass3Exercise array1 = new _3_ArrayClass3Exercise(arraySize);

        _3_ArrayClass3Exercise [] array2 = new _3_ArrayClass3Exercise[array1.getArraySize()];

        for (int ctr = 0; ctr < array2.length; ctr++) {
            array2[ctr] = new _3_ArrayClass3Exercise(JOptionPane.showInputDialog("Enter Strings: "));

        }
        for (int ctr = 0; ctr < array2.length; ctr++) {
            JOptionPane.showMessageDialog(null, array2[ctr].getKeys());
        }
    }



	}

NUMBER 5

public class _5_ArrayClass5Exercise {
	double arraySize;
	String message;
	int keys;

	//Constructor
	public _5_ArrayClass5Exercise(double arraySize) {
		this.arraySize = arraySize;
	}

	public _5_ArrayClass5Exercise(int keys, String message) {
		this.keys = keys;
		this.message = message;

	}

	public double getArraySize() {
		return arraySize;
	}
	public void setArraySize(double arraySize) {
		this.arraySize = arraySize;
	}
	public String getMessage() {
		return message;
	}
	public void setMessage(String message) {
		this.message = message;
	}
	public int getKeys() {
		return keys;
	}
	public void setKeys(int keys) {
		this.keys = keys;
	}
}

NUMBER 6

import javax.swing.*;

public class _6_ArrayClassRunnerExercise {

	public static void main(String[] args) {
		double arraysize;
        arraysize = Double.parseDouble(JOptionPane.showInputDialog ("Enter Array Size: "));

        _5_ArrayClass5Exercise array1 = new _5_ArrayClass5Exercise(arraysize);

        _5_ArrayClass5Exercise [] array2 = new _5_ArrayClass5Exercise[(int) array1.getArraySize()];

        for (int ctr = 0; ctr < array2.length; ctr++) {
            array2[ctr]= new _5_ArrayClass5Exercise(Integer.parseInt(JOptionPane.showInputDialog("Enter keys: ")), JOptionPane.showInputDialog ("Enter message: "));
        }
        for (int ctr = 0; ctr < array2.length; ctr++) {
            JOptionPane.showMessageDialog(null, array2[ctr].getKeys() +" "+ array2[ctr].getMessage());
        }
    }

}