字符串操作:判断相等、判断首尾、大小写转换
判断是否相等:s.equals()
判断是否相等(忽略大小写):s.equalsIgnoreCase()
判断起始结尾:s.startsWith(),s.endsWith()
转大小写:s.toLowerCase(), s.toUpperCase()
String s = "We are boys", s1 = "WE ARE BOYS"; // 是否相等 boolean b = s.equals(s1); boolean b1 = s.equalsIgnoreCase(s1); System.out.println("s是否等于s1:" + b + "\ns是否等于s1(忽略大小写):" + b1); //判断起始与结尾 boolean b2 = s.startsWith("we"); boolean b3 = s.endsWith("boys"); System.out.println("s以“we”开始吗?" + b2 + "\ns以“boys”结束吗?" + b3); //转大小写 String news1=s.toLowerCase(); String news2=s.toUpperCase(); System.out.println("小写:"+news1); System.out.println("大写"+news2);