java boolean array

Author: JavaProgramTo.com

src/main/java/com/javaprogramto/arrays/booleanarray/BooleanArrayExample.java

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+package com.javaprogramto.arrays.booleanarray;
+
+public class BooleanArrayExample {
+
+	public static void main(String[] args) {
+		
+		boolean[] array1 = {};
+
+		boolean[] array2 = { false, true, true };
+
+		boolean[] array3 = new boolean[5];
+	}
+}

src/main/java/com/javaprogramto/arrays/booleanarray/BooleanArrayExample2.java

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+package com.javaprogramto.arrays.booleanarray;
+
+public class BooleanArrayExample2 {
+
+	public static void main(String[] args) {
+
+		// way 1
+		boolean[] array1 = { false, true, true };
+
+		// way 2
+		boolean[] array2 = new boolean[4];
+
+		array2[0] = true;
+		array2[1] = false;
+		array2[2] = true;
+		array2[3] = false;
+
+		// way 3
+		boolean[] array3 = new boolean[5];
+
+		for (int i = 0; i < array3.length; i++) {
+			array3[i] = i % 2 == 0;
+		}
+
+	}
+}

src/main/java/com/javaprogramto/arrays/booleanarray/BooleanArrayExample3.java

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+package com.javaprogramto.arrays.booleanarray;
+
+public class BooleanArrayExample3 {
+
+	public static void main(String[] args) {
+
+		boolean[] array1 = { false, true, true };
+
+		boolean[] array2 = new boolean[4];
+
+		array2[0] = true;
+		array2[1] = false;
+		array2[2] = true;
+		array2[3] = false;
+
+		boolean[] array3 = new boolean[5];
+
+		for (int i = 0; i < array3.length; i++) {
+			array3[i] = i % 2 == 0;
+		}
+
+		System.out.println("array1[0] value - " + array1[0]);
+		System.out.println("array2[1] value - " + array2[1]);
+		System.out.println("array3 last index value - " + array3[array3.length - 1]);
+		
+		System.out.println("\nboolean array 3 all values using foreach ");
+		for(boolean b : array3) {
+			System.out.println(b);
+		}
+
+	}
+}

src/main/java/com/javaprogramto/arrays/booleanarray/BooleanArrayExample4.java

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+package com.javaprogramto.arrays.booleanarray;
+
+public class BooleanArrayExample4 {
+
+	public static void main(String[] args) {
+
+		boolean[] array4 = new boolean[4];
+
+		System.out.println("Checking the default values of boolean array 4 with for each loop");
+		for (boolean b : array4) {
+			System.out.println(b);
+		}
+
+	}
+}

src/main/java/com/javaprogramto/arrays/booleanarray/BooleanArrayExample5.java

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+package com.javaprogramto.arrays.booleanarray;
+
+public class BooleanArrayExample5 {
+
+	public static void main(String[] args) {
+
+		boolean[] array5 = new boolean[5];
+
+		System.out.println("Default value of array5 at index 1 is - " + array5[1]);
+
+		System.out.println("Setting to true for all indexes of array 5 using simple for loop");
+		for (int i = 0; i < array5.length; i++) {
+			array5[i] = true;
+		}
+		System.out.println("Now Default value of array5 at index 1 is - " + array5[1]);
+
+	}
+}

src/main/java/com/javaprogramto/arrays/booleanarray/BooleanArrayExample6.java

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+package com.javaprogramto.arrays.booleanarray;
+
+import java.util.Arrays;
+
+public class BooleanArrayExample6 {
+
+	public static void main(String[] args) {
+
+		boolean[] array6 = new boolean[5];
+
+		System.out.println("Default values of array5 are " + Arrays.toString(array6));
+
+		Arrays.fill(array6, true);
+
+		System.out.println("New Default values of array5 are " + Arrays.toString(array6));
+	}
+}

src/main/java/com/javaprogramto/arrays/booleanarray/BooleanArrayExample7.java

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+package com.javaprogramto.arrays.booleanarray;
+
+import java.util.Arrays;
+
+public class BooleanArrayExample7 {
+
+	public static void main(String[] args) {
+
+		boolean[] array1 = {};
+		System.out.println("array1 length - " + array1.length);
+
+		boolean[] array2 = new boolean[2];
+		System.out.println("array2 values - " + Arrays.toString(array2));
+
+		for (int i = 0; i < array2.length; i++) {
+			array2[i] = true;
+		}
+
+		System.out.println("New array2 values - " + Arrays.toString(array2));
+
+		System.out.println("Acccessing array values by index - " + array2[1]);
+
+		boolean[] array7 = new boolean[5];
+
+		System.out.println("Default values of array7 are " + Arrays.toString(array7));
+
+		Arrays.fill(array7, true);
+
+		System.out.println("New Default values of array7 are " + Arrays.toString(array7));
+	}
+}

src/main/java/com/javaprogramto/arrays/multidimensional/NestedArraysExample1.java

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+package com.javaprogramto.arrays.multidimensional;
+
+import org.apache.commons.lang3.ArrayUtils;
+
+public class NestedArraysExample1 {
+
+	public static void main(String[] args) {
+
+		int[] array1 = {};
+
+		int[] array2 = new int[0];
+
+		int[] array3 = ArrayUtils.EMPTY_INT_ARRAY;
+		
+		System.out.println("array1 length is "+array1.length);
+		System.out.println("array2 length is "+array2.length);
+		System.out.println("array3 length is "+array3.length);
+
+	}
+
+}

src/main/java/com/javaprogramto/arrays/multidimensional/NestedArraysExample2.java

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+package com.javaprogramto.arrays.multidimensional;
+
+import java.util.Arrays;
+import java.util.Collections;
+
+public class NestedArraysExample2 {
+
+	public static void main(String[] args) {
+
+		int[] array1 = { 0, 0 };
+
+		int[] array2 = new int[5];
+
+		int[] array3 = new int[5];
+		Arrays.fill(array3, 5);
+
+		Integer[] array4 = Collections.nCopies(array3.length, 0).toArray(new Integer[0]);
+
+		System.out.println("array1[0] value " + array1[0]);
+		System.out.println("array2[0] value " + array2[0]);
+		System.out.println("array3[0] value " + array3[0]);
+		System.out.println("array4[0] value " + array4[0]);
+
+	}
+
+}

src/main/java/com/javaprogramto/arrays/multidimensional/NestedArraysExample3.java

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+package com.javaprogramto.arrays.multidimensional;
+
+public class NestedArraysExample3 {
+
+	public static void main(String[] args) {
+
+		// Assigning values when array is getting created
+		int[][] array1 = { { 1, 2, 3 }, { 4, 5, 6 } };
+
+		// Create an array first and then next assing values using for loop.
+		int[][] array2 = new int[5][5];
+		int count = 1;
+		for (int i = 0; i < array2.length; i++) {
+
+			for (int j = 0; j < array2[0].length; j++) {
+				array2[i][j] = count;
+				count++;
+			}
+		}
+
+		System.out.println("2D array values by index");
+		System.out.println("array1[1][1] - "+array1[1][1]);
+		System.out.println("array2[2][2] - "+array2[2][2]);
+		
+		System.out.println("array1 full valus");
+		for (int i = 0; i < array1.length; i++) {
+
+			for (int j = 0; j < array1[0].length; j++) {
+				System.out.print(array1[i][j]+" ");
+			}
+			System.out.println();
+		}
+
+	}
+}