题目内容
This character is one that appears at the end, or right side, of a string, after the non-space characters:（这个字符出现在字符串的末尾或右侧，非空格字符之后：）
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When you are writing a program with String objects that may have unwanted spaces at the beginning or end of the strings, use this method to delete them.（当你使用字符串对象编程时，字符串的开头或结尾可能有不需要的空格，使用什么方法删除它们？）
现有：public class Tester {public static void main(String[] args) {int x = 5;Integer x1 = x;Integer x2 = x;int x3 = new Integer(5);System.out.print(x1.equals(x));System.out.print(x1 == x);System.out.print(x2.equals(x1));System.out.print(x2 == x1);System.out.print(x2 == x3);System.out.print(x2.equals(x3));}}结果为：
String foo="blue";boolean[] bar=new boolean[1];if(bar[0]){foo="green";}foo的值是多少? （ ）
int index=1;String[] test=new String[3];String foo=test[index];foo的值是多少? （ ）
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