java选择题100题.pdf
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2021-10-02
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一、 选择
1、下面哪些是 java 语言中的关键字？
A.si zeof
B abstract
C NULL
D Native
2、下面语句哪个是正确的？
A char='abc';
B long l=oxfff;
C float f=0.23;
D double=0.7E-3;
3、以下程序测试 String 类的各种构造方法，试选出其运行效果。
class STR{
public static void main(String args[]){
String s1=new String();
String s2=new String("String 2");
char chars[]={'a',' ',' s','t','r','i','n','g'};
String s3=new String(chars);
String s4=new String(chars,2,6);
byte bytes[]={0,1,2,3,4,5,6,7,8,9};
StringBuffer sb=new StringBuffer(s3);
String s5=new String(sb);
System.out.println("The String No.1 is "+s1);
System.out.println("The String No.2 is "+s2);
System.out.println("The String No.3 is "+s3);
System.out.println("The String No.4 is "+s4);
System.out.println("The String No.5 is "+s5);
}
}
A The String No.1 is
The String No.2 is String 2
The String No.3 is a string
The String No.4 is string
The String No.5 is a string
B The String No.1 is
The String No.2 is String 2
The String No.3 is a string
The String No.4 is tring
The String No.5 is a string
C The String No.1 is
The String No.2 is String 2
The String No.3 is a string
The String No.4 is strin
The String No.5 is a string
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