java <=0?0:1 是什么意思；
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what does mean in java <=0?0:1;
提问by Educ
I'm trying to understand this program in java but i'm new to this language.
我正在尝试用 Java 理解这个程序，但我对这门语言还不熟悉。
Can you tell me what
你能告诉我什么吗
<=0?0:1;
means?
方法？
It's from the following code that decrements the elements of a matrix (tabu)
它来自以下代码，它减少了矩阵的元素（禁忌）
public void decrementTabu(){
for(int i = 0; i<tabuList.length; i++){
for(int j = 0; j<tabuList.length; j++){
tabuList[i][j]-=tabuList[i][j]<=0?0:1;
}
}
}
采纳答案by Shivan Dragon
tabuList[i][j]-=tabuList[i][j]<=0?0:1;
can be written as:
可以写成：
int tabuListEntry = tabuList[i][j];
tabuListEntry -=tabuListEntry <=0?0:1;
can be written as:
可以写成：
int tabuListEntry = tabuList[i][j];
tabuListEntry = tabuListEntry - (tabuListEntry <=0?0:1);
can be written as:
可以写成：
int tabuListEntry = tabuList[i][j];
int decrementAmount = tabuListEntry <=0?0:1;
tabuListEntry = tabuListEntry - decrementAmount ;
can be written as:
可以写成：
int tabuListEntry = tabuList[i][j];
int decrementAmount = 0;
if(tabuListEntry <= 0) {
decrementAmount = 0;
} else {
decrementAmount = 1;
}
tabuListEntry = tabuListEntry - decrementAmount ;
can be written as:
可以写成：
int tabuListEntry = tabuList[i][j];
int decrementAmount = 0;
if(tabuListEntry > 0) {
decrementAmount = 1;
}
tabuListEntry = tabuListEntry - decrementAmount ;
can be written as:
可以写成：
int tabuListEntry = tabuList[i][j];
if(tabuListEntry > 0) {
tabuListEntry = tabuListEntry - 1;
}
回答by Oded
You are not looking at the operator correctly.
您没有正确看待操作员。
This is the conditional operator ?:, which is the only ternary operator in JavaScript or Java (and other languages, such as C#). Ternary means it has three parameters.
这是条件运算符?:，它是 JavaScript 或 Java（以及其他语言，例如 C#）中唯一的三元运算符。三元意味着它具有三个参数。
Essentially this is what it means:
基本上这就是它的意思：
(condition)?(true branch):(false branch)
param1 param2 param3
In your code example, the condition (param1) is:
在您的代码示例中，条件 (param1) 是：
tabuList[i][j]<=0
If true, 0 (param2) is returned. If false, 1 (param3) is returned.
如果为真，则返回 0 (param2)。如果为 false，则返回 1 (param3)。
The return value is then decremented from tabuList[i][j]via the -=operator.
然后tabuList[i][j]通过-=运算符递减返回值。
The whole statement:
整个声明：
tabuList[i][j]-=tabuList[i][j]<=0?0:1;
Can be written as:
可以写成：
if (tabuList[i][j] > 0)
tabuList[i][j]--;
回答by Thilina
This is work as if condition, will take "c<=0?0:1;"
这就像条件一样工作，将采用“c<=0?0:1;”
This means if c is less than or equal to zero then answer is 0 else 1
这意味着如果 c 小于或等于 0，则答案为 0 否则为 1
