题目内容

已知:String s = "ABCD1234";int a=s.indexOf("123",3);int b=s.lastIndexOf("123",3);则a、b的值分别为

A. 4,4
B. 4,-1
C. -1,4
D. -1,-1

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已知:String s = "AB12ab12";String s1= s.replace("12","CD");String s2= s.replaceAll("12","CD");则s1、s2的值分别为:

ABCDab12, ABCDabCD
B. ABCDabCD, ABCDab12
C. AB12abCD, ABCDab12
D. ABCDabCD, ABCDabCD

已知String s1 = "ABCD1234"; String s2="abcd1234"; 下面结果为true的是

A. s1==s2;
B. s1.equals(s2);
C. s1. equalsIgnoreCase (s2);
D. s1.compareTo(s2);

已知String s1 = "ABCD1234";String s2 = new String("ABCD1234");下面结果为true 的是:

A. s1==s2;
B. s1==s2.intern();
C. s1.compareTo(s2);
D. s1.isEmpty();

已知String s = "xxxxxxxxxxxxxxx#123#456#zzzzz";int n = s.indexOf("#");int k = s.indexOf("#", n+1);int m = s.indexOf("#", k+1);String s2 = s.substring(m+1);System.out.println(s2);则输出的结果是：

A. 123456
B. 123
C. xxxxxxxxxxxxxxx
D. zzzzz