這個課程的參考視訊和圖片來自youtube。

    主要學到的知識點有：(the same use in C/C++)

1. while loop

• while(i < max){} will keep executing if i < max is true, otherwise will jump out from the while loop. Possible execute 0 times. 

max = 5;
i = 0;
while(i < 5){
System.out.printf("%d ", i);
i++;}

// the result will be like this
 

0, 1, 2, 3, 4    

• do {} while (i < max) is similar like before, only difference is that the loop body will be execute at least once. 
• while(true) { if (i < max) {break;}}   Whenever see break; will jump out from the while loop. 

max = 5;
i = 0;
while(true){
System.out.printf("%d ", i);
i++;
if (i >= max){
break;}}

// the result will be like this
0, 1, 2, 3, 4