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Given the following code segment, what is in the string referenced by s1?

String s1 = "xy";
String s2 = s1;
s1 = s1 + s2 + "z";
把两个s1z连接起来,注意中间没有空格。
2

What is the value of len after the following executes?

String s1 = "Hey, buddy!";
int len = s1.length();
共有11个字符,注意空格也算在内。
3

What is the value of pos after the following code executes?

String s1 = "ac ded ca";
int pos = s1.indexOf("d");
注意位置从0开始计算。
1

What is the value of s1 after the following code executes?

String s1 = "Hey";
String s2 = s1.substring(0,1);
String s3 = s2.toLowerCase();
无论之后进行什么操作,只要s1没有被另赋新值,其内容始终不变。
1


陈 欣

AADPS创始人

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