关于Exception in thread "main" java.lang.NumberFormatException: For input string: " 1 "的缘由和解决方法

运行这段程序java public class test { public static void main(String [] args) { String a=" 1 "; int b=Integer.parseInt(a); System.out.printf("%d",b); } } 终端会报出错误： Exception in thread “main” java.lang

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