- 下面那些方法不是接口 Collection 中已声明的方法 ( )?
- 下面的程序创建了一个文件输出流对象，用来向文件test.txt 中输出数据，假设程序当前目录下不存在文件test.txt，编译下面的程序 Test.java后，将该程序运行 3 次，则文件 test.txt 的内容是 ( )。import java.io.*;public class Test {public static void main(String args[]) {try {String s="ABCDE";byte b[]=s.getBytes();FileOutputStream file=new FileOutputStream("test.txt",true);file.write(b);file.close();}catch(IOException e) {System.out.println(e.toString());}}}
- 应用程序的 main 方法中有以下语句，则输出的结果是 ( )。String s1="0.5", s2="12";double x=Double.parseDouble(s1);int =Integer.parseInt(s2);System.out.println(x+y);
- 程序 Test.java编译运行后输出的结果是 ( )。public class Test {String s1="java";public static void main(String args[]) {int z=2;Test t=new Test();System.out.println(t.s1+z);}}
- 应用程序的 main 方法中有以下语句，则执行后输出的结果是 ( )。
- 应用程序的 main 方法中有以下语句，则输出的结果是 ( )。int b[][]={{1}, {2,2}, {2,2,2}};int sum=0;for(int i=0;ifor(int j=0;jsum*=b[i][j];}}System.out.println("sum="+sum);
- 应用程序 Test.java的源程序如下，在命令行键入：java Test aaa bb c回车后输出的结果是 ( )。public class Test {public static void main(String args[]) {int k1=args.length;int k2=args[1].length();System.out.print(k1+""+k2);}}
- 下面程序段执行后 b 的值是 ( )。Integer integ =new Integer(9);boolean b = integ instanceof Object;
- 应用程序的 main 方法中有以下语句，则输出的结果是 ( )。String s="12345#aaa#bbb#67890";int n=s.indexOf("#");int k=s.indexOf("#",n+1);int m=s.indexOf("#",k+1);String s2=s.substring(m+1);System.out.println(s2);
- 下面语句的功能是 ( )。RandomAccessFile raf2 = new RandomAccessFile("1.txt","rw" );
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