测试

char[] s1 = {'I',' ','l','o','v','e',' ','j','a','v','a'}//s1 = I love java
String s2 = new String("ejb");
s2.getChars(0,3,s1,7);//s1 = I love ejba
System.out.println(s1);
结果为：
I love ejba

　　

String s = "www.fkit.org";String ss = "it";
System.out.println("s.indexOf('r'):" + s.indexOf('r'));
System.out.println("s.indexOf('r',2):" + s.indexOf('r',2));
System.out.println("s.indexOf(ss):" + s.indexOf(ss));
结果为：
s.indexOf('r'):10
s.indexOf('r',2):10
s.indexOf(ss):6