多选题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 }Apublic int sum（int a， int b） { return a + b； }Bpublic int sum（long a， long b） { return 0； }Cabstract int sum（）；Dprivate long sum（long a， long b） { return a + b； }Epublic long sum（long a， int b） { return a + b； }
多选题
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； }
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