特例 FOR 循环

for 其实可以不用初始化部分，迭代表达式

boolean done = false;
for(int<wbr><span style="font-size:18px"> i = 1; !done;/i++){<br></span><wbr><span style="font-size:18px"></span><wbr><span style="font-size:18px"></span><wbr><span style="font-size:18px"> //....<br></span><wbr><span style="font-size:18px"></span><wbr><span style="font-size:18px"> if()done =true;<br> }<br> FOR将一直循环，直到BOOLEAN变理DONE被设置为真，它没有测试“i”的值。<br><br> 还可以这样<br> int i ;<br> boolean done = false;<br> i = 0;<br> for(; !done;){<br></span><wbr><span style="font-size:18px"></span><wbr><span style="font-size:18px"> system.out.println("i is "+i);<br></span><wbr><span style="font-size:18px"></span><wbr><span style="font-size:18px"> if(i == 10){<br></span><wbr><span style="font-size:18px"></span><wbr><span style="font-size:18px"></span><wbr><span style="font-size:18px"></span><wbr><span style="font-size:18px"> done = true;<br></span><wbr><span style="font-size:18px"></span><wbr><span style="font-size:18px"></span><wbr><span style="font-size:18px"></span><wbr><span style="font-size:18px"></span><wbr><span style="font-size:18px"></span><wbr><span style="font-size:18px">i++;<br></span><wbr><span style="font-size:18px"></span><wbr><span style="font-size:18px"> }<br> }<br><br><br> 如果故意要无限，很好办<br><br> for( ; ; ){<br> //....<br> }<br></span></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>