1. 引用操縱對(duì)象 String s;這里只是創(chuàng)建了引用而不是對(duì)象朝聋，此時(shí)向s發(fā)送消息會(huì)返回一個(gè)運(yùn)行時(shí)錯(cuò)誤，String s = new String('asdf'); or ...
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Think in java 學(xué)習(xí)筆記：JAVA中幾乎一切都是對(duì)象
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1. 引用操縱對(duì)象 String s;這里只是創(chuàng)建了引用而不是對(duì)象朝聋，此時(shí)向s發(fā)送消息會(huì)返回一個(gè)運(yùn)行時(shí)錯(cuò)誤，String s = new String('asdf'); or ...
