忽略Java中的大写和小写
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Ignoring upper case and lower case in Java
提问by Noah Skull Weijian
I want to know how to make whatever the user inputs to ignore case in my method:
我想知道如何使用户输入的任何内容忽略我的方法中的大小写：
public static void findPatient() {
if (myPatientList.getNumPatients() == 0) {
System.out.println("No patient information is stored.");
}
else {
System.out.print("Enter part of the patient name: ");
String name = sc.next();
sc.nextLine();
System.out.print(myPatientList.showPatients(name));
}
}
采纳答案by Patrik H?ggren
You have to use the String method .toLowerCase()or .toUpperCase()on both the input and the string you are trying to match it with.
您必须使用 String 方法.toLowerCase()或.toUpperCase()在输入和您尝试与之匹配的字符串上使用。
Example:
例子：
public static void findPatient() {
System.out.print("Enter part of the patient name: ");
String name = sc.nextLine();
System.out.print(myPatientList.showPatients(name));
}
//the other class
ArrayList<String> patientList;
public void showPatients(String name) {
boolean match = false;
for(matchingname : patientList) {
if (matchingname.toLowerCase.contains(name.toLowerCase())) {
match = true;
}
}
}
回答by peterremec
use toUpperCase() or toLowerCase() method of String class.
使用 String 类的 toUpperCase() 或 toLowerCase() 方法。
回答by dieter
Use String#toLowerCase()or String#equalsIgnoreCase()methods
用途String#toLowerCase()或String#equalsIgnoreCase()方法
Some examples:
一些例子：
String abc = "Abc".toLowerCase();
boolean isAbc = "Abc".equalsIgnoreCase("ABC");
回答by alain.janinm
You ignore case when you treat the data, not when you retrieve/store it. If you want to store everything in lowercase use String#toLowerCase, in uppercase use String#toUpperCase.
处理数据时忽略大小写，而不是检索/存储数据时。如果要以小写形式存储所有内容，请使用String#toLowerCase，在大写形式中使用String#toUpperCase。
Then when you have to actually treat it, you may use out of the bow methods, like String#equalsIgnoreCase(java.lang.String). If nothing exists in the Java API that fulfill your needs, then you'll have to write your own logic.
然后，当您必须实际处理它时，您可以使用 out of the bow 方法，例如String#equalsIgnoreCase(java.lang.String)。如果 Java API 中不存在满足您需求的任何内容，那么您将不得不编写自己的逻辑。
回答by Naf Ty
I have also tried all the posted code until I found out this one
我也尝试了所有发布的代码，直到我发现了这个
if(math.toLowerCase(Locale.ENGLISH));
Here whatever character the user input will be converted to lower cases.
在这里，用户输入的任何字符都将转换为小写。
回答by user10018672
The .equalsIgnoreCase() method should help with that.
.equalsIgnoreCase() 方法应该对此有所帮助。
