T1 - first param type 第1个参数类型T2 - second param type 第2个参数类型T3 - third param type 第3个参数类型T4 - fourth param type 第4个参数类型E - Exception or subclass of Exception Exception类及其子类@FunctionalInterface public interface VT4<T1,T2,T3,T4,E extends Exception>
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