Dav*_*ell 1 java methods class arraylist object
我的程序我有复制和粘贴代码(一个明显的禁忌)因为我还没有弄清楚如何将我想要的参数传递给这个方法:
public String collectionToFormattedString() {
String combined = "";
for (Book b : LibObj.books) {
combined = combined + b.toString() + "<br />";
}
combined = "<HTML>" + combined +"</HTML>";
return combined;
}
我想传递参数来执行以下操作:
public String collectionToFormattedString(Object? XYZ, ArrayList ABC) {
String combined = "";
for (XYZ b : ABC) {
combined = combined + b.toString() + "<br />";
}
combined = "<HTML>" + combined +"</HTML>";
return combined;
}
我该怎么做呢？
你可以这样做:
public <T> String collectionToFormattedString(T XYZ, List<T> ABC) {
String combined = "";
for (T b : ABC) {
combined = combined + b.toString() + "<br />";
}
combined = "<HTML>" + combined +"</HTML>";
return combined;
}
编辑
我刚刚意识到你甚至没有使用第一个参数,正如@rgettman指出的那样,你没有使用任何特定的操作T,因此你可以将其简化为:
public String collectionToFormattedString(final List<?> list) {
StringBuilder combined = new StringBuilder("<HTML>");
for (Object elem : list) {
combined.append(elem.toString()).append("<br />");
}
combined.append("</HTML>");
return combined.toString();
}
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