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多项选择题 Given the following code, which method declarations, when inserted at the indicated position, will not cause the program to fail compilation?()   public class Qdd1f {   public long sum(long a, long b) {  return a + b;  }   // insert new method declaration here  }  

A、public int sum(int a, int b) { return a + b; }

B、public int sum(long a, long b) { return 0; }

C、abstract int sum();

D、private long sum(long a, long b) { return a + b; }

E、public long sum(long a, int b) { return a + b; }

  • A,E
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