string4.java

java程序设计 清华出版社 孙燮华老师编写的程序源代码

//String4.java
public class String4{
  public static void main(String args[]){
    String s1="Java", s2="java", s3="Welcome", s4="Welcome";
        
    System.out.println("s1 = "+ s1 + ", s2 = " + s2 + ", s3 = " + s3 + ", s4 = " + s4);
    System.out.println("s2.toUpper() = "+s2.toUpperCase());//小写换大写
    System.out.println("s3 + s1 = " + s3 + s1);            //与下面一句功能相同
    System.out.println("s3.concat(s1) = " + s3.concat(s1));//与上面一句功能相同
    System.out.println("s3.replace('e', 'r') = " + s3.replace('e', 'r'));//字符e换成r
    System.out.println("s4.toLowerCase() = " + s4.toLowerCase());        //大写换小写    
  }
}