如何重复这种类型的for循环？

Question

for (int i=0; i<oMsg.length(); i = i + interval) {
    work += oMsg.substring(i, i+1); 
}

我想重复这一点但只改变int i = part 例如

for (int i=0; i<oMsg.length(); i = i + interval) {
    work += oMsg.substring(i, i+1); 
}
for (int i=1; i<oMsg.length(); i = i + interval) {
    work += oMsg.substring(i, i+1); 
}

for (int i=2; i<oMsg.length(); i = i + interval) {
    work += oMsg.substring(i, i+1); 
}

Answer 1

添加第二个循环：

for (int j = 0; j < 3; ++j) {
  for (int i = j; i < oMsg.length(); i += interval) {
    work += oMsg.substring(i, i + 1); 
  }
}