在看Thinking in Java中的第六章复用类的第一个例题
其中在toString()方法中,
public String toString(){
return
"valve1 = " + valve1 = "\n" +
"valve2 = " + valve2 = "\n" +
"valve3 = " + valve3 = "\n" +
"valve4 = " + valve4 = "\n" +
"i = " + i + "\n" +
"f = " + f + "\n" +
"source = " + source;
}
编译的时候也无法通过出现
SprinklerSystem.java:18: unexpected type
required: variable
found : value
"valve1 = " + valve1 = "\n" +
^
SprinklerSystem.java:19: unexpected type
required: variable
found : value
"valve2 = " + valve2 = "\n" +
^
SprinklerSystem.java:20: unexpected type
required: variable
found : value
"valve3 = " + valve3 = "\n" +
^
SprinklerSystem.java:21: unexpected type
required: variable
found : value
"valve4 = " + valve4 = "\n" +
^
4 errors
请教一下各位,有没有这样使用return语句的?
如果可以这样使用的话,为什么我不能编译通过?
其中在toString()方法中,
public String toString(){
return
"valve1 = " + valve1 = "\n" +
"valve2 = " + valve2 = "\n" +
"valve3 = " + valve3 = "\n" +
"valve4 = " + valve4 = "\n" +
"i = " + i + "\n" +
"f = " + f + "\n" +
"source = " + source;
}
编译的时候也无法通过出现
SprinklerSystem.java:18: unexpected type
required: variable
found : value
"valve1 = " + valve1 = "\n" +
^
SprinklerSystem.java:19: unexpected type
required: variable
found : value
"valve2 = " + valve2 = "\n" +
^
SprinklerSystem.java:20: unexpected type
required: variable
found : value
"valve3 = " + valve3 = "\n" +
^
SprinklerSystem.java:21: unexpected type
required: variable
found : value
"valve4 = " + valve4 = "\n" +
^
4 errors
请教一下各位,有没有这样使用return语句的?
如果可以这样使用的话,为什么我不能编译通过?
"valve1 = " + valve1 "\n" +
"valve2 = " + valve2 "\n" +
"valve3 = " + valve3 "\n" +
"valve4 = " + valve4 "\n" +
"i = " + i + "\n" +
"f = " + f + "\n" +
"source = " + source;
把那几个等号去掉就可以了!
是只要和对应的函数类型返回值类型对上就可以了吧
那如果是类类型的呢?应该返回什么东西??
能再详细解释一下,是在主方法执行到哪里后,自动执行的 public static void main(String[] args){
SprinklerSystem sprinklers = new SprinklerSystem();
System.out.println(sprinklers);
}谢谢!!!
地址如下
http://community.csdn.net/Expert/topic/4296/4296281.xml?temp=.8654596
如果能得到理想的答案,立即揭帖
谢谢大家的解答,非常感谢!
SprinklerSystem sprinklers = new SprinklerSystem();
System.out.println(sprinklers);//这一句时自动调用toString()
}