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多选题
Given two collection objects referenced by col1 and col2，which of these statements are true？（）
A
The operation col1.retainAll（col2） will not modify the col1 object.
B
The operation col1.removeAll（col2） will not modify the col2 object.
C
The operation col1.addAll（col2） will return a new collection object， containing elements from both col1 and col2.
D
The operation col1.containsAll（Col2） will not modify the col1 object.
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更多 “多选题Given two collection objects referenced by col1 and col2，which of these statements are true？（）AThe operation col1.retainAll（col2） will not modify the col1 object.BThe operation col1.removeAll（col2） will not modify the col2 object.CThe operation col1.addAll（col2） will return a new collection object， containing elements from both col1 and col2.DThe operation col1.containsAll（Col2） will not modify the col1 object.” 相关考题
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Given two collection objects referenced by col1 and col2，which of these statements are true？（）A、The operation col1.retainAll（col2） will not modify the col1 object.B、The operation col1.removeAll（col2） will not modify the col2 object.C、The operation col1.addAll（col2） will return a new collection object， containing elements from both col1 and col2.D、The operation col1.containsAll（Col2） will not modify the col1 object.
考题
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单选题If a unique constraint is defined on column COL1 of table TAB1, what are the characteristics of COL1?（）A
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考题
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单选题Which statement is true？（）A
A class’s finalize（） method CANNOT be invoked explicitly.B
super.finalize（） is called implicitly by any overriding finalize（） method.C
The finalize（） method for a given object is called no more than once by the garbage collector.D
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多选题Given a class whose instances， when found in a collection of objects， are sorted by using the compareTo（） method， which two statements are true？（）AThe class implements java.lang.Comparable.BThe class implements java.util.Comparator.CThe interface used to implement sorting allows this class to define only one sort sequence.DThe interface used to implement sorting allows this class to define many different sort sequences.
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Line 16B
Line 17C
Line 18D
Line 19
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单选题The following statements: CREATE TABLE t1 (col1 INT NOT NULL, PRIMARY KEY(col1)); CREATE TABLE t2 (col1 INT NOT NULL, col2 CHAR(1) NOT NULL, PRIMARY KEY (col1, col2), FOREIGN KEY (col1) REFERENCES t1 (col1) ON DELETE CASCADE ON UPDATE RESTRICT); CREATE TABLE t3 (col1 INT NOT NULL, col2 INT NOT NULL, PRIMARY KEY (col1, col2),FOREIGN KEY (col1) REFERENCES t1 (col1) ON DELETE NO ACTION ON UPDATE RESTRICT);INSERT INTO t1 VALUES (1), (2); INSERT INTO t2 VALUES (1, 'a'), (1, 'b'), (2,'c'); INSERT INTO t3 VALUES (1, 100), (2, 200), (2,300); How many rows will be deleted by the following DELETE statement? DELETE FROM t1 WHERE col1= 1;（）A
4B
3C
1D
0
考题
单选题11.class Snoochy{ 12.Boochybooch； 13.public Snoochy（）{booch=newBoochy（this）；} 14.} 15. 16.class Boochy{ 17.Snoochy snooch； 18.public Boochy（Snoochys）{snooch=s；} 19.} And the statements： 21.public static void main（String[]args）{ 22.Snoochy snoog=new Snoochy（）； 23.snoog=null； 24.//more code here 25.} Which statement is true about the objects referenced by snoog，snooch，and booch immediately after line 23 executes？（）A
None of these objects are eligible for garbage collection.B
Only the object referenced by booch is eligible for garbage collection.C
Only the object referenced by snoog is eligible for garbage collection.D
Only the object referenced by snooch is eligible for garbage collection.E
The objects referenced by snooch and booch are eligible for garbage collection.
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