A:
举一反三
- public class ChangeStrDemo { public static void changeStr(String str){ str="welcome"; } public static void main(String[] args) { String str="home"; changeStr(str); System.out.println(str); } }给出程序的运行结果( )
- public class Test { public static void main(String[] args) { String s1 = "abc"; String s2 = new String ("abc"); System.out.println(s1 == s2); } } 程序运行结果是
- 下面程序段的输出结果是 public class A{ public static void main(String args[]) { String str ="Hello,"; str=str+"Guys!"; System.out.println(str); } }
- 有如下代码: public class Test{ public static void main(String args[]) { String str = new String("World"); char ch[] = {'H','e','l','l','o'}; change(str,ch); System.out.println(str + "and" + ch); } public static void change(String str, char ch[]) { str = "Changed"; ch[0] = 'C'; } } 运行后输出的结果是:
- public class Example{ public static void main(String[] args) { String[] strs = { "Tom", "Jerry", "Donald" }; // foreach循环遍历数组 for (String str : strs) { str = "Tuffy"; } System.out.println(strs[0] + "," + strs[1] + "," + strs[2]); } } 下列选项中,程序的运行结果是
内容
- 0
下面是一段javabean 程序,该程序的运行结果是 ( ) 。public class NullTest{public static void main(String[] args){int M = 0;String str = null;StringBuffer sb = new StringBuffer(“= “);sb.append(str);sb.append(M++);System.out.println(sb.toString());}} A: =null B: =null0 C: =null1 D: =nullM
- 1
给定以下代码,程序的运行结果是 ()public class Example {String str=new String("good");char [] ch={'a','b','c'};public static void main(String[] args) {Example ex=new Example();ex.change(ex.str, ex.ch);System.out.print(ex.str+"and");System.out.print(ex.ch);}public void change(String str,char ch[]){str="test ok";ch[0]='g';}} A: goodandabc B: goodandgbc C: test okandabc D: test okandgbc
- 2
下列代码执行结果是?( ) class HelloWorld { public static void modifyString(final String str) { str = "Hello World!"; } public static void main(String[] args) { String a = new String("Hello Java"); modifyString(a); System.out.println(“a = ” + a); } } A: a = Hello Java B: a = Hello World C: 代码编译错误 D: 运行时异常
- 3
以下程序运行结果为? public class Q { public static void main(String argv[]) { String a[]= new String[5]; System.out.println(a[0]); } }
- 4
public class Test{ public static void main(String[] args){ System.out.println(5/2); } }