Wrapper methods programs

 Here are Java programs based on wrapper classes and their methods, showing only input and output:

✅ 1. Convert String to int

Input: "123"
Output: 133

String s = "123";
int num = Integer.parseInt(s);
System.out.println(num + 10);

✅ 2. String to Integer object

Input: "456"
Output: 912

String s = "456";
Integer obj = Integer.valueOf(s);
System.out.println(obj * 2);

✅ 3. Check if char is digit

Input: '5'
Output: It's a digit.

char c = '5';
if(Character.isDigit(c)) {
    System.out.println("It's a digit.");
}

✅ 4. Check if char is letter

Input: 'a'
Output: true

char ch = 'a';
System.out.println(Character.isLetter(ch));

✅ 5. Convert upper to lower

Input: 'A'
Output: 'a'

char upper = 'A';
System.out.println(Character.toLowerCase(upper));

✅ 6. Convert lower to upper

Input: 'm'
Output: 'M'

char lower = 'm';
System.out.println(Character.toUpperCase(lower));

✅ 7. Compare integers

Input: 10, 20
Output: -1

System.out.println(Integer.compare(10, 20));

✅ 8. Get MAX, MIN

Output:
Max: 2147483647
Min: -2147483648

System.out.println("Max: " + Integer.MAX_VALUE);
System.out.println("Min: " + Integer.MIN_VALUE);

✅ 9. int to String

Input: 100
Output: 100 is now a String.

int n = 100;
String str = String.valueOf(n);
System.out.println(str + " is now a String.");

✅ 10. Parse boolean

Input: "true"
Output: true

String s = "true";
boolean b = Boolean.parseBoolean(s);
System.out.println(b);

✅ 11. Parse float from string

Input: "45.67"
Output: 50.67

String price = "45.67";
float f = Float.parseFloat(price);
System.out.println(f + 5);

✅ 12. Long from string

Input: "9876543210"
Output: Mobile: 9876543210

String val = "9876543210";
Long mobile = Long.valueOf(val);
System.out.println("Mobile: " + mobile);

✅ 13. ASCII value

Input: 'A'
Output: ASCII: 65

char ch = 'A';
int ascii = (int) ch;
System.out.println("ASCII: " + ascii);

✅ 14. isUpperCase

Input: 'G'
Output: true

char c = 'G';
System.out.println(Character.isUpperCase(c));

✅ 15. Use doubleValue

Input: "123.456"
Output: 133.456

Double d = Double.valueOf("123.456");
System.out.println(d.doubleValue() + 10.0);

✅ 16. Check lowercase

Input: 'z' → Output: true

System.out.println(Character.isLowerCase('z'));

✅ 17. Check whitespace

Input: ' ' → Output: true

System.out.println(Character.isWhitespace(' '));

✅ 18. Double to String

Input: 12.5 → Output: "12.5"

double d = 12.5;
String s = Double.toString(d);
System.out.println(s);

✅ 19. Autobox int to Integer

Input: 99 → Output: Integer: 99

int x = 99;
Integer obj = x;
System.out.println("Integer: " + obj);

✅ 20. Unbox Integer to int

Input: 42 → Output: int: 42

Integer val = 42;
int i = val;
System.out.println("int: " + i);

✅ 21. Character get numeric value

Input: '5' → Output: 5

System.out.println(Character.getNumericValue('5'));

✅ 22. Float to int

Input: "12.9" → Output: 12

float f = Float.parseFloat("12.9");
int i = (int) f;
System.out.println(i);

✅ 23. Check alphabet

Input: '9' → Output: false

System.out.println(Character.isAlphabetic('9'));

✅ 24. Long parse

Input: "123456" → Output: 124456

long l = Long.parseLong("123456");
System.out.println(l + 1000);

✅ 25. Boolean valueOf

Input: "false" → Output: false

Boolean b = Boolean.valueOf("false");
System.out.println(b);

✅ 26. Byte from string

Input: "120" → Output: 130

byte b = Byte.parseByte("120");
System.out.println((byte)(b + 10));

✅ 27. Short from string

Input: "2000" → Output: 3000

short s = Short.parseShort("2000");
System.out.println((short)(s + 1000));

✅ 28. Compare Double

Input: 12.3, 15.6 → Output: -1

System.out.println(Double.compare(12.3, 15.6));

✅ 29. Boolean logical operation

Input: "true" & "false" → Output: false

Boolean b1 = Boolean.valueOf("true");
Boolean b2 = Boolean.valueOf("false");
System.out.println(b1 && b2);

✅ 30. Char to int using wrapper

Input: 'B' → Output: 66

char ch = 'B';
System.out.println((int) ch);

✅ 31. Character.isDefined

Input: '%' → Output: true

System.out.println(Character.isDefined('%'));

✅ 32. Character.isISOControl

Input: '\n' → Output: true

System.out.println(Character.isISOControl('\n'));

✅ 33. Boolean parse from mixed case

Input: "TrUe" → Output: true

System.out.println(Boolean.parseBoolean("TrUe"));

✅ 34. Integer.toHexString

Input: 255 → Output: ff

System.out.println(Integer.toHexString(255));

✅ 35. Integer.toBinaryString

Input: 10 → Output: 1010

System.out.println(Integer.toBinaryString(10));

✅ 36. Integer.toOctalString

Input: 64 → Output: 100

System.out.println(Integer.toOctalString(64));

✅ 37. CompareTo for Integer

Input: 20, 10 → Output: 1

Integer a = 20;
Integer b = 10;
System.out.println(a.compareTo(b));

✅ 38. Float.compare

Input: 5.4, 5.4 → Output: 0

System.out.println(Float.compare(5.4f, 5.4f));

✅ 39. Convert char to string

Input: 'x' → Output: x

char ch = 'x';
String s = Character.toString(ch);
System.out.println(s);

✅ 40. Character.isTitleCase

Input: 'ลŠ' → Output: true

System.out.println(Character.isTitleCase('ลŠ'));

✅ 41. Check uppercase

Input: 'D' → Output: true

System.out.println(Character.isUpperCase('D'));

✅ 42. Parse negative int

Input: "-89" → Output: -79

int val = Integer.parseInt("-89");
System.out.println(val + 10);

✅ 43. Character.isSurrogate

Input: '\uD800' → Output: true

System.out.println(Character.isSurrogate('\uD800'));

✅ 44. Convert int to float

Input: 25 → Output: 25.0

int i = 25;
Float f = (float) i;
System.out.println(f);

✅ 45. Convert float to double

Input: 5.2f → Output: 5.2

float f = 5.2f;
Double d = (double) f;
System.out.println(d);

✅ 46. Wrapper null check

Output: Wrapper is null

Integer i = null;
if(i == null) System.out.println("Wrapper is null");

✅ 47. Wrapper to String then concat

Input: 200 → Output: 200Rs

Integer val = 200;
String price = val.toString() + "Rs";
System.out.println(price);

✅ 48. Parse double scientific

Input: "1.2e2" → Output: 120.0

double d = Double.parseDouble("1.2e2");
System.out.println(d);

✅ 49. Character.getType

Input: 'A' → Output: 1

System.out.println(Character.getType('A'));

✅ 50. Byte value check

Input: Byte.MAX_VALUE → Output: 127

System.out.println(Byte.MAX_VALUE);

✅ 51. Boolean XOR

Input: true, false → Output: true

System.out.println(true ^ false);

✅ 52. Short.MAX_VALUE

Output: 32767

System.out.println(Short.MAX_VALUE);

✅ 53. Integer.reverse

Input: 123 → Output: -1073741824

System.out.println(Integer.reverse(123));

✅ 54. Parse boolean with random case

Input: "TRUE" → Output: true

System.out.println(Boolean.parseBoolean("TRUE"));

✅ 55. Integer.byteValue

Input: 130 → Output: -126

Integer i = 130;
System.out.println(i.byteValue());

✅ 56. Float intValue

Input: 9.75f → Output: 9

Float f = 9.75f;
System.out.println(f.intValue());

✅ 57. Wrapper equals

Input: 100, 100 → Output: true

Integer a = 100, b = 100;
System.out.println(a.equals(b));

✅ 58. ParseInt with base

Input: "A", base 16 → Output: 10

System.out.println(Integer.parseInt("A", 16));

✅ 59. Double.NaN check

Output: true

System.out.println(Double.isNaN(0.0/0));

✅ 60. Double infinity check

Input: 1.0/0 → Output: true

System.out.println(Double.isInfinite(1.0/0));

✅ 61. Integer.highestOneBit

Input: 18 → Output: 16

System.out.println(Integer.highestOneBit(18));

✅ 62. Integer.lowestOneBit

Input: 18 → Output: 2

System.out.println(Integer.lowestOneBit(18));

✅ 63. Long.bitCount

Input: 15 → Output: 4

System.out.println(Long.bitCount(15));

✅ 64. Integer.signum

Input: -10 → Output: -1

System.out.println(Integer.signum(-10));

✅ 65. Double.compare NaN

Input: Double.NaN, 5.0 → Output: 1

System.out.println(Double.compare(Double.NaN, 5.0));


✅ 66. Convert char to int using wrapper

Input: '8'
Output: 8

char c = '8';
int n = Character.getNumericValue(c);
System.out.println(n);

✅ 67. Check if space is whitespace

Input: ' '
Output: true

System.out.println(Character.isWhitespace(' '));

✅ 68. Byte parse from String

Input: "127"
Output: 127

String val = "127";
byte b = Byte.parseByte(val);
System.out.println(b);

✅ 69. Short parse from String

Input: "32000"
Output: 32000

String s = "32000";
short sh = Short.parseShort(s);
System.out.println(sh);

✅ 70. Use Integer.reverse()

Input: 10
Output: 1431655765

System.out.println(Integer.reverse(10));

✅ 71. Use Double.toHexString()

Input: 12.25
Output: 0x1.8p3

System.out.println(Double.toHexString(12.25));

✅ 72. Parse Boolean with "TRUE"

Input: "TRUE"
Output: true

System.out.println(Boolean.parseBoolean("TRUE"));

✅ 73. Use Long.highestOneBit()

Input: 10L
Output: 8

System.out.println(Long.highestOneBit(10L));

✅ 74. Float compare

Input: 10.5f, 20.3f
Output: -1

System.out.println(Float.compare(10.5f, 20.3f));

✅ 75. Character.isDefined()

Input: 'A'
Output: true

System.out.println(Character.isDefined('A'));

✅ 76. Character.getType()

Input: '9'
Output: 9 (TYPE_DECIMAL_DIGIT_NUMBER)

System.out.println(Character.getType('9'));

✅ 77. Boolean.toString(false)

Input: false
Output: "false"

System.out.println(Boolean.toString(false));

✅ 78. Byte.MAX_VALUE

Output: 127

System.out.println(Byte.MAX_VALUE);

✅ 79. Byte.MIN_VALUE

Output: -128

System.out.println(Byte.MIN_VALUE);

✅ 80. Double.isInfinite()

Input: 1.0/0.0
Output: true

double d = 1.0 / 0.0;
System.out.println(Double.isInfinite(d));

✅ 81. Float.isNaN()

Input: 0.0f/0.0f
Output: true

float f = 0.0f / 0.0f;
System.out.println(Float.isNaN(f));

✅ 82. Character.toTitleCase()

Input: 'g'
Output: G

System.out.println(Character.toTitleCase('g'));

✅ 83. Character.digit()

Input: 'F', radix 16
Output: 15

System.out.println(Character.digit('F', 16));

✅ 84. Boolean logical XOR

Input: true, false
Output: true

System.out.println(Boolean.logicalXor(true, false));

✅ 85. Integer.divideUnsigned()

Input: 10, 3
Output: 3

System.out.println(Integer.divideUnsigned(10, 3));

✅ 86. Integer.remainderUnsigned()

Input: 10, 3
Output: 1

System.out.println(Integer.remainderUnsigned(10, 3));

✅ 87. Integer.toUnsignedString()

Input: -1
Output: 4294967295

System.out.println(Integer.toUnsignedString(-1));

✅ 88. Long.toBinaryString()

Input: 20L
Output: 10100

System.out.println(Long.toBinaryString(20L));

✅ 89. Character.isSurrogate()

Input: 'a'
Output: false

System.out.println(Character.isSurrogate('a'));

✅ 90. Double.equals()

Input: 10.0, 10.0
Output: true

Double d1 = 10.0, d2 = 10.0;
System.out.println(d1.equals(d2));

✅ 91. Integer.toOctalString()

Input: 100
Output: 144

System.out.println(Integer.toOctalString(100));

✅ 92. Integer.toHexString()

Input: 255
Output: ff

System.out.println(Integer.toHexString(255));

✅ 93. Long.rotateLeft()

Input: 5, 2
Output: 20

System.out.println(Long.rotateLeft(5L, 2));

✅ 94. Long.rotateRight()

Input: 20, 2
Output: 5

System.out.println(Long.rotateRight(20L, 2));

✅ 95. Use Float.hashCode()

Input: 3.14f
Output: (some int hash)

System.out.println(Float.hashCode(3.14f));

✅ 96. Use Double.hashCode()

Input: 5.5
Output: (some int hash)

System.out.println(Double.hashCode(5.5));

✅ 97. Use Boolean.hashCode()

Input: true
Output: 1231

System.out.println(Boolean.hashCode(true));

✅ 98. Character.charCount()

Input: 0x1F600
Output: 2

System.out.println(Character.charCount(0x1F600));

✅ 99. Character.isISOControl()

Input: \u0009 (tab)
Output: true

System.out.println(Character.isISOControl('\u0009'));

✅ 100. Convert primitive double to Double object

Input: 50.5
Output: 50.5

double x = 50.5;
Double d = Double.valueOf(x);
System.out.println(d);


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