T1 - type of the 1st param. 第1个参数类型T2 - type of the 2nd param. 第2个参数类型R - return type 返回值类型E - Throwable or subclass of Throwable. Throwable类及其子类@FunctionalInterface public interface RT2<T1,T2,R,E extends Throwable> extends LambdaRT<R,E>, Lambda2<T1,T2>
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