4Q CSS

• Expression operands


  Values involved in an operation
• Relational operators


  Used to check the relations between two operands
• Relational operators


  • Also called comparison operators
  • Result is always a Boolean value
• A value involved in an operation is called an operand
• If statement


  If the condition is true, execute the code block, else execute the else block

  
• If-else statement


  If condition is true, execute if block, else execute else block

  
• If-elseif-else statement


  If condition1 is true, execute if block, else if condition2 is true, execute elseif block, else execute else block

  
• Logical operators


  Used in conditional statements
• Nested if


  A conditional statement within another conditional statement
• Methods


  Reusable blocks of code that perform a specific task
• Array


  Used to store multiple values of the same data type in a single variable
• Arrays


  • Provide a way to store multiple values of the same type in a contiguous memory block
  • Array indexing starts at 0
• Accessing array


  Using the index number to access a specific element
• Loops


  Execute a block of code as long as a specified condition is reached
• While loop


  Loops through a block of code as long as a specified condition is true
• Changing array element


  Refer to the index number to change the value of a specific element
• Iterating arrays


  Reading every element inside an array and doing something with it
• Array length


  The size of an array, found by calling the length property
• Array indexing starts at?

  0
• String a reference data type that can store one or more characters reference data types have access to useful methods
• .equals(""); // compare Two string if the string start from Upper Case // the comparing string must be Upper Case
• .equalsIgnoreCase(" ") // ignoring Case Sensitivity
• .length(); // returns the length of a specified string
• .charAt(whole number); // returns the character at the specified // Index in a string
• .indexOf(""); // returns the position of the first occurrence of // specified characters in a string
• .isEmpty(); // checks whether a string is empty or not
• .toUpperCase(); // converts a string to upper case
• .toLowerCase(); // returns the string in lower case
• .replace(oldChar, newChar);

  // replace all occurrences of a String

  // in another String or all occurrences

  // of a char with another char