Question

Java:

1. Create the skeleton.

• Create a new file called ‘BasicJava4.java’
• Create a class in the file with the appropriate name.
  • public class BasicJava4 {
• Add four methods to the class that return a default value.
  • public static boolean isAlphabetic(char aChar)
  • public static int round(double num)
  • public static boolean useSameChars(String str1, String str2)
  • public static int reverse(int num)

2. Implement the methods.

• public static boolean isAlphabetic(char aChar): Returns true if the argument is an alphabetic character, return false otherwise. Do NOT use the Character class.
• public static int round(double num): return num after rounding. Round up if the decimal is greater than or equal to .5, round down otherwise. Do NOT use the Math class.
• public static boolean useSameChars(String str1, String str2): Returns true if both str1 and str2 use the same characters. For example, return true when str1 is “hello whim” and str2 is “mellow him”.
• public static int reverse(int num): Reverse the digits in num and return the result. For example, if num is 49386 then return 68394. Do not use Math, Integer or StringBuilder classes.

Do NOT use: Math, Integer, Character or StringBuilder classes to complete these methods.
1. Create the skeleton. Create a new file called 'BasicJava4.java' Create a class in the file with the appropriate name. public class BasicJava4 { Add four methods to the class that return a default value. o O public static boolean isAlphabetic(char aChar) public static int round(double num) public static boolean useSamechars(String str1, String str2) o public static int reverse(int num) O 2. Implement the methods. public static boolean isAlphabetic(char achar): Returns true if the argument is an alphabetic character, return false otherwise. Do NOT use Character class. . public static int round[double num): return num after rounding. Round up if the decimal is greater than or equal to.5, round down otherwise. Do NOT use the Math class. public static boolean use Same Chars(String str1, String str2): Returns true if both str1 and str2 use the same characters. For example, return true when str1 is "hello whim” and str2 is "mellow him". public static int reverse(int num): Reverse the digits in num and return the result. For example, if num is 49386 then return 68394. Do not use Math, Integer or StringBuilder classes. Do NOT use: Math, Integer, Character or StringBuilder classes to complete these methods.

Answer 1

Code

public class BasicJava4 {

public static boolean isAlphabetic(char aChar)
{
return (aChar >= 'a' && aChar <= 'z') || (aChar >= 'A' && aChar <= 'Z');
}
public static int round(double num)
{
int roundedNum=(int)num;
if(num%1>=0.5)
roundedNum+=1;
return roundedNum;
}
public static boolean useSameChars(String str1, String str2)
{
boolean found;
for(int i=0;i<str1.length();i++)
{
found=false;
for(int j=0;j<str2.length();j++)
{
if(str1.charAt(i)==str2.charAt(j))
{
found=true;
break;
}
}
if(!found)
return false;
}
return true;
}
public static int reverse(int num)
{
int reverseNum=0;
int rem;
while(num>0)
{
rem=num%10;
num/=10;
reverseNum=reverseNum*10+rem;
}
return reverseNum;
}
public static void main(String[] args)
{
//test isAlphabetic function.
System.out.println("Testing isAlphabetic function");
System.out.println("a isAlphabetic: "+isAlphabetic('a'));
System.out.println("H isAlphabetic: "+isAlphabetic('H'));
System.out.println("9 isAlphabetic: "+isAlphabetic('9'));
  
  
//test round function.
System.out.println("\nTesting round function");
System.out.println("2.6 round to : "+round(2.6));
System.out.println("2.3 round to : "+round(2.3));
  
//test useSameChars function.
System.out.println("\nTesting useSameChars function");
System.out.println("hello whim and mellow him uses same chacters : "+useSameChars("hello whim","mellow him"));
System.out.println("zim whim and mellow him uses same chacters : "+useSameChars("zim whim","mellow him"));
  
//test reveese function.
System.out.println("\nTesting reveese function");
System.out.println("49386 in revese is "+reverse(49386));
System.out.println("1234 in revese is "+reverse(1234));
}
}

all the function are in bold

output

Output > Debugger Console * Basic function without Charcter class and math function (run) x DD Testing isAlphabetic function a isAlphabetic: true H isAlphabetic: true 9 isAlphabetic: false OR UD Testing round function 2.6 round to : 2.3 round to : 2 قيا Testing useSameChars function hello whim and mellow him uses same chacters : true zim whim and mellow him uses same chacters : false Testing reveese function 49386 in revese is 68394 1234 in revese is 4321 BUILD SUCCESSFUL (total time: 10 seconds)

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