成员变量声明和初始化

package lianxii;

public class Book {

private String title;

public void setTitle(String title1) {

title = title1;
}

public String getTitle() {

return title;
}

public static void main(String[] args) {

Book b = new Book();
b.setTitle("titlejuiiuuu");//调用上面setTitle方法
String s = b.getTitle();//调用上面getTitle方法
String t = s.toLowerCase();
String u = s.toUpperCase();
System.out.println(s);
System.out.println(t);
System.out.println(u);
}
}