替换算法

Question

for(k = i - 1; k >= 0; k--) { 
    if(frame[j] == page[k]) 
     break; 
    least = least < k ? least : k;   
} 

我不明白这条线 “least = least < k ? least : k;”

任何一个可以解释这对我

Answer 1

这相当于

least = Math.min(least, k); 

或

if (!(least < k)) { 
    least = k 
} 

另请参阅：the Java documentation on the ternary operator（滚动到“条件运算符”部分）。

Answer 2

least = least < k ? least : k; 

这相当于，

if(least < k) 
    least = least; 
else 
    least = k;