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Java认证考试综合练习

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单项选择题

class Thread2 implements Runnable { 
void run() { 
System.out.print("go "); 
} 
public static void main(String [] args) { 
Thread2 t2 = new Thread2(); 
Thread t = new Thread(t2); 
t.start(); 
} 
}  
结果为()

A.go
B.编译失败
C.代码运行,无输出结果
D.运行时异常被抛出

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单项选择题 class Output {  public static void main(String [] args) {  int i = 4;  System.out.print("3" + i + " ");  System.out.print(i + 4 + "6");  System.out.println(i + "7");  }  }  结果为()

单项选择题 class Wrench {  public static void main(String [] args) {  Wrench w = new Wrench(); Wrench w2 = new Wrench();  w2 = go(w,w2);  System.out.print(w2 == w);  }  static Wrench go(Wrench wr1, Wrench wr2) {  Wrench wr3 = wr1; wr1 = wr2; wr2 = wr3;  return wr3; }  }  结果是什么?()

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