what does the continue keyword do in java

1int i = 0;
2while (i < 10) {
3  if (i == 4) {
4    i++;  //why do I need this line ?
5    continue;
6  }
7  System.out.println(i);
8  i++;
9}

1   int number = 4;
2        int finalnum = 20;
3        while(number <= finalnum){
4            number++;
5            if(number %2 != 0){//Each odd number restarts the loop
6              continue;
7            }
8            System.out.println("Even Number!: "+ number);
9        }
10    }//EOM