01. Java条件语句之 if
02. Java条件语句之 if...else
03. Java条件语句之 多重if
04. Java条件语句之 嵌套if
05. Java条件语句之 switch
06. Java循环语句之 while：先判断，后执行
07. Java循环语句之 do...while：先执行，后判断（至少执行一次）
08. Java循环语句之 for
package imooc;
public class practice {
public static void main(String[] args) {
//normal test
for (int a=1; a<=5; a++) {
System.out.println("a");
}
//omit initialization of variable
int b=1;
for ( ; b<=5; b++) {
System.out.println("b");
}
//omit condition -> endless loop
//for (int c=1; ; c++) {
// System.out.println("c");
//}
//omit changing of variable
for (int d=1; d<=5; ) {
System.out.println("d");
d++;
}
//multiple variables
for (int e=1,f=2; e<=5; e++,f--) {
System.out.println(e+"+"+f+"="+(e+f));
}
}
}
09. Java循环跳转语句之 break：退出指定循环
10. Java循环跳转语句之 continue：跳过循环体中剩余语句，执行下一次循环
11. Java循环语句之 多重循环
package imooc;
public class practice {
public static void main(String[] args) {
System.out.println("right triangle");
for(int i=1; i<=3; i++) {
for(int j=1; j<=i; j++) {
System.out.print("*");
}
System.out.println();
}
}
}
12. Practice：Judge digits
package imooc;
public class practice {
public static void main(String[] args) {
int num = 999;
int count=1;
for (count=1; (num/=10)!=0; count++);
System.out.println(count);
}
}