例子如下:
public static void main(String[] args) {/* * while循环 * while(表达式){循环体} * 表达式满足就执行循环体,直到不满足条件就跳出循环 *//* * 分别求出1~200之间的奇数之和,偶数之和 */int i=1,sum=0,sum1=0;while(i<201){if(i%2!=0){sum+=i;}if(i%2==0){sum1+=i;}i++;}System.out.println("1~200之间的奇数和为:"+sum);System.out.println("1~200之间的偶数和为:"+sum1);/* * do{}while(); * 至少会执行一次!!!! *//*do{if(i%2!=0){sum+=i;}if(i%2==0){sum1+=i;}i++;}while(i<201);System.out.println("1~200之间的奇数和为:"+sum);System.out.println("1~200之间的偶数和为:"+sum1); *//* * * * ** * *** * **** * ***** */int a = 1;while(a<6){int b=5-a;while(b>0){System.out.print(" ");b--;}while(b<a){System.out.print("*");b++;}System.out.println();a++;}System.out.println("");System.out.println("-----------------------------------------");/* * 1 * 22 * 333 * 4444 * 55555 */int i1=1;while(i1<6){int j=0;while(j<i1-1){System.out.print(i1);j++;}System.out.println(i1);i1++;}System.out.println("---------------------------------------------");/* * * * * * * * * * * * * * * */int t=1;while(t<6){int g=5-t;while(g>0){System.out.print(" ");g--;}while(g<t){System.out.print("* ");g++;}System.out.println();t++;}}}