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Java 11 检查字符串是否为空或只有空格

 2 years ago
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Java 11 检查字符串是否为空或只有空格

isBlank() 方法检查字符串是否为空或只有空格。

如果字符串为空或仅包含空白代码点，isBlank() 方法返回 true ，否则返回false。 String API 有另一个方法isEmpty()也检查字符串是否为空。

String input = "java-jdon";
boolean isBlank = input.isBlank();
System.out.println(isBlank);

String input2 = "";
isBlank = input2.isBlank();
System.out.println(isBlank);

String input3 = "   ";
isBlank = input3.isBlank();
System.out.println(isBlank);

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