java - 检查字符串是否包含Java中的数字值

Question

如何编写一个方法来查找给定字符串是否包含数字？如果字符串包含数字，则该方法应返回 true，否则返回 false。

Answer 1

if(str.matches(".*\\d.*")){
   // contains a number
} else{
   // does not contain a number
}

以前建议的解决方案，不起作用，但由于@Eng.Fouad 的请求/建议而恢复。

建议的解决方案不起作用

String strWithNumber = "This string has a 1 number";
String strWithoutNumber = "This string does not have a number";

System.out.println(strWithNumber.contains("\d"));
System.out.println(strWithoutNumber.contains("\d"));

工作解决方案

String strWithNumber = "This string has a 1 number";
if(strWithNumber.matches(".*\\d.*")){
    System.out.println("'"+strWithNumber+"' contains digit");
} else{
    System.out.println("'"+strWithNumber+"' does not contain a digit");
}

String strWithoutNumber = "This string does not have a number";
if(strWithoutNumber.matches(".*\\d.*")){
    System.out.println("'"+strWithoutNumber+"' contains digit");
} else{
    System.out.println("'"+strWithoutNumber+"' does not contain a digit");
}

输出

'This string has a 1 number' contains digit
'This string does not have a number' does not contain a digit