import java.util.ArrayList; public class RunoobTest { public static void main(String[] args) { ArrayList<String> sites = new ArrayList<String>(); sites.add("Google"); sites.add("Runoob"); sites.add("Taobao"); sites.add("Weibo"); System.out.println(sites.get(1)); // 访问第二个元...
这个报红,并显示错误:String() in String cannot be applied to (byte[]) 1、问题原因:引入错了String的包,查看import中导入的是 import com.sun.org.apache.xpath.internal.operations.String; 2、解决方法:删掉,改用 java.lang.string 包即可
其实就是说:程序当中所有的双引号字符串,都是String类的对象。...public String(char[] array):根据字符数组的内容,来创建对应的字符串。 public String(byte[] array):根据字节数组的内容,来创建对应的字符串。...public String concat(Str...
ArrayList类提供了toArray()方法,该方法将ArrayList直接转换为Array。 可以通过以下方式完成。 package com; import java.util.ArrayList; public class ArrayListToArray { public static void main(String args[]){ ArrayList<String> list=new ArrayList<String>(); //Adding few elements in ArrayList list.add("...
这个报红,并显示错误:String() in String cannot be applied to (byte[]) 1、问题原因:引入错了String的包,查看import中导入的是 import com.sun.org.apache.xpath.internal.operations.String; 1. 2、解决方法:删掉,改用 java.lang.string 包即可
for(String temp:listA){ System.out.println(temp); } } 运行时会抛出如下异常: Exception in thread "main" java.lang.UnsupportedOperationException at java.util.AbstractList.add(AbstractList.java:148) 原因分析: 在使用Arrays.asList()后调用add,remove这些method时出现java.lang.UnsupportedOperationException异...
for(String str: list){ //等同于 for(Iterator i = list.iterator; i.hasNext(); ) if(str.equals("C")){ list.remove(str); } } 1. 2. 3. 4. 5. 结果: 删除前:[A, B, B, C, C, C, D, D, D, D] Exception in thread "main" java.util.ConcurrentModificationException ...
ArrayList<String>names=newArrayList<>(Arrays.asList("alex","brian","charles")); 1.2. UsingList.of()[Java 9 and above] We can useList.of()static factory methods tocreate unmodifiable lists. The only drawback is thatadd()operation is not supported in these lists. ...
LENGTH = 100000; public static void main(String[] args) { List<String> list...
In the examples above, we created elements (objects) of type "String". Remember that a String in Java is an object (not a primitive type). To use other types, such as int, you must specify an equivalent wrapper class: Integer. For other primitive types, use: Boolean for boolean, ...