String方法
判断是否相等:
String a = "令狐冲"; String b = "令狐"; String c = "冲"; String d = new String("令狐冲"); String e = b + c; System.out.println(a == (b + c)); System.out.println(a == d); System.out.println(e == (b + c)); d.intern(); System.out.println(a == d); d = d.intern(); System.out.println(a == d);
String 大小写转换:
String str = "ABC";
String str1 = "abc";
System.out.println("ABC大写转小写: " + str.toLowerCase());
System.out.println("abc小写转大写: " + str1.toUpperCase());