目录前言switch使用总结前言 jdk21支持了新的switch属性 switch使用 在JDK21之前，switch不支持传入null，否则直接抛异常
Most IDEs (Eclipse, Netbeans, Intelij) provide contextually smart suggestions about the current statement you\'re writing.We would like to do the same thing (In Java for Java).
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