题目内容
下列哪个叙述是错误的？
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下列【1】、【2】、【3】、【4】注释标注的哪行代码有错误？public class E {public static void main (String[]args){String s = new String("ABCABC");boolean m = s.equals("");//【1】s = s.replaceAll("[ABC]+","**");//【2】s = s.substring(1);//【3】int n = s.length ;//【4】System.out.println(s);}}
下列【1】、【2】、【3】、【4】注释标注的哪行代码有错误？public class E {public static void main (String[]args){String str = new String("ABCABC");char c = str.charAt(2);//【1】byte [] b =str.getBytes();//【2】String s = str.subString(0,3);//【3】boolean boo= str.contains("Java"); //【4】}}
下列【1】、【2】、【3】、【4】注释标注的哪行代码有错误？public class E {public static void main (String[]args){String s = null;s = String("ok");//【1】String str = "123";//【2】str = str.toLowerCase();//【3】str = "【1】、【2】、【3】、【4】".toUpperCase();//【4】System.out.println(str);}}
对于如下代码，下列哪个叙述是正确的？public class E {public static void main(String args[]){String strOne = new String("你好");String strTwo = strOne;strOne = new String("hello");System.out.println(strTwo);}}
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