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toJSONString传入空对象如何返回null而不是字符串null #4495
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if("null".equals(s)){
s=null;
} 完美(滑稽) |
源码 public final void write(Object object) {
if (object == null) {
this.out.writeNull();
} else {
... public void writeNull() {
this.write("null");
} |
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输出
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