for(int i=0; i<10; i++) {
     int a = 10;
     System.out.printf(a+i);
}

for(int i=0; i<10; i++) {
            int e = i;
            System.out.println(e+i);
       }/* output:
0
2
4
6
8
10
12
14
16
18

------解决方案--------------------
10次,
  0:   iconst_0
  1:   istore_1
  2:   iload_1
  3:   bipush  10
  5:   if_icmpge       26
  8:   bipush  10      //a
  10:  istore_2
  11:  getstatic       #2; //Field java/lang/System.out:Ljava/io/PrintStream;
  14:  iload_2
  15:  iload_1
  16:  iadd
  17:  invokevirtual   #3; //Method java/io/PrintStream.println:(I)V
  20:  iinc    1, 1
  23:  goto    2
  26:  return