java - Printing a method -

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i need call method returns code below. using in enhanced loop objects in array. however, when try print out, error.

public string tostring(){     return string.format("length:%d\nwidth:%d\nheight:%d\n", length,width,height);

this used main.

for(box n:boxes) system.out.printf(n.tostring());

the error is

exception in thread "main" java.util.illegalformatconversionexception: d != java.lang.double


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