摘要:
class test { public static void main(String[] args) { String a = " "; //带有空格的字符串 if ( a.isEmpty() ) { System.out.println("empty"); } else { System.out 阅读全文
摘要:
class test { public static void main(String[] args) { String a = " "; //带有空格的字符串 if ( a.isEmpty() ) { System.out.println("empty"); } else { System.out 阅读全文
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