在java中对字符串使用或运算符
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using or operator on String in java
提问by Dip
I want to check a string with a multiple values using or operator , is that possible ?
我想使用 or 运算符检查具有多个值的字符串，这可能吗？
like if(str.equals("A" || "B" || "C")){
//do this
}
else if(str.equals("D" || "E" || "F")){
//do that
}
I am getting error while compiling, that || can not be used in string
编译时出错， || 不能在字符串中使用
采纳答案by arshajii
You can also use a switchin Java 7:
您还可以switch在 Java 7 中使用 a ：
switch (str) {
case "A":
case "B":
case "C":
// do this
break;
case "D":
case "E":
case "F":
// do that
break;
}
This might be more readable if you have many strings you want to compare against. For reference, see the "Using Strings in switch Statements" section of the switchStatementtutorial.
如果您有许多要比较的字符串，这可能更具可读性。如需参考，请参阅switchStatement教程的“在 switch 语句中使用字符串”部分。
回答by Josh M
if(str.equals("A") || str.equals("B") || str.equals("C")){ .... }
if(str.equals("A") || str.equals("B") || str.equals("C")){ .... }
You have to separate your conditions.
你必须分开你的条件。
回答by dasblinkenlight
You do not need an ORin this case: you can write the same condition like this:
OR在这种情况下，您不需要 an ：您可以像这样编写相同的条件：
if (Arrays.asList("A", "B", "C").contains(str)) {
...
}
This test is successful when the test string stris contained in the list specified in the call to asList, which conveniently takes a variable number of parameters.
当测试字符串str包含在调用中指定的列表中时，此测试成功asList，这方便地采用可变数量的参数。
