StringDemo1.java

public class StringDemo{

  public static void main(String[] args){

    String text="hello";

 

    System.out.println("字符串内容: "+text);

    System.out.println("字符串长度:"+text.length());

    System.out.println("等于hello? "+text.equals("hello"));

    System.out.println("转为大写: "+text.toUpperCase());

    System.out.println("转为小写: "+text.toLowerCase());

  }

}