Java-大小写转换

package demo4;

public class Demo16 {

  public static void main(String[] args) {
    // TODO Auto-generated method stub
      
    String str ="abc DEF";
    String strLow=str.toLowerCase();//转换成小写
    String strUp =str.toUpperCase();//装换成大写
    System.out.println(strLow);
    System.out.println(strUp);
  }

}