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Java X ((Number class (Supported utils (Arithmetic function (abs() …

- - - - Boxing:
        Converting primitive data types into object,
        is taken care by the compiler
        
        E.g.
        Integer x = 5; // boxes int to an Integer object
    - - Arithmetic function
        
        abs()
        
        ceil(), floor()
        
        min(), max()
        
        exp(), log()
        
        pow(), sqrt()
        
        sin(), cos()
        .....
      - Return primitive value
        
        syntax: xxxValue()
        
        byteValue()
        
        shortValue
        ....
      - Others
        
        equals()
        
        toString()
        
        random()
        ...
  - - - The letter checking
        
        isLetter()
        
        isDigit()
        
        isWhitespace()
        
        isUpperCase()
        
        isLowerCase()
      - Convert to character
        
        toUpperCase()
        
        toLowerCase()
        
        toString()
  - - - string length
        
        length()
      - format string creating
        
        String str;
        str = String.format("format string")
      - Others
        
        compareTo()
        
        hashCode()
        ...
- - - - for (int i = 0; i < 5; i++)
    - - for (type variable : arrayname)
- - - - dataType[] arrayRefVar = {value0, value1, ..., valuek};
      - dataType[] arrayRefVar = new dataType[arraySize];
    - - void printArray(int[] array);
    - - Some common utils:
        
        sort();
        
        binarySearch()
        ....