Good Programming exercises

1. Java program to replace certain characters of a String

public class Testing {

    public static void main(String args[]) {
        String str = "String";
        char temp[] = str.toCharArray();
        char charToBeChanged = 'g';
        char changeChar = 'G';
        char temp1[] = replaceCharacter(temp, charToBeChanged, changeChar);
        for (int j = 0; j < temp1.length; j++) {
            System.out.print(temp1[j]);
        }
    }

    private static char[] replaceCharacter(char[] temp, char charToBeChanged, char changeChar) {
        char temp1[] = new char[temp.length];
        for (int i = 0; i < temp.length; i++) {
            if (temp[i] == charToBeChanged) {
                temp1[i] = changeChar;
            } else {
                temp1[i] = temp[i];
            }
        }
        return temp1;
    }
}

// Output StrinG

1. Java program to find the occurrences of distinct words from a file
You need to understand the basics of Java Streams. A stream is a sequence of data. A stream can be either 1. InputStream - read data from a source 2. OutputStream - write data to a destination Byte Stream - Java stream that is used to read/write data in the form of bytes.