由于Java中的对象都是引用,所以当ArrayList中的元素不是基本数据类型时,其contain(object)和remove(object)等方法都不能达到预期效果。目前我只会用遍历ArrayList,查找值与所查对象相等的元素,再操作。
stringList.remove(i); } 1. 2. 3. 仔细观察上面代码你会发现,其实i是Integer对象,而由于Java系统中如果找不到准确的对象,会自动向上升级,而(int < Integer < Object),所以在调用stringList.remove(i)时,其实使用的remove(object object),而很明显stringList不存在Integer对象,自然会移除失败(0.0),Java也不会...
Removes the first occurrence of the specified element from this list, if it is present (optional operation). If this list does not contain the element, it is unchanged. More formally, removes the element with the lowest indexisuch that(o==null ? get(i)==null : o.equals(get(i)))(if...
* 否则抛出"参数不合法异常"IllegalArgumentException */ public ArrayList(int initialCapacity) { if (initialCapacity > 0) { this.elementData = new Object[initialCapacity]; } else if (initialCapacity == 0) { this.elementData = EMPTY_ELEMENTDATA; } else { throw new IllegalArgumentException("Illegal C...
1.2、直接使用list.remove(Object o) ArrayList.remove(Object o)源码的逻辑和ArrayList.remove(int index)大致相同:列表索引坐标从小到大循环遍历,若列表中存在与入参对象相等的元素,则把该元素移除,后面的元素都往左移动一位,返回true,若不存在与入参相等的元素,返回false。
Remove an integer from the list by position and by value: importjava.util.ArrayList;publicclassMain{publicstaticvoidmain(String[]args){ArrayList<Integer>list=newArrayList<Integer>();list.add(5);list.add(8);list.add(9);list.add(1);list.remove(Integer.valueOf(1));// Remove by objectlist....
Namespace: Java.Util.Concurrent Assembly: Mono.Android.dll To be added [Android.Runtime.Register("remove", "(Ljava/lang/Object;Ljava/lang/Object;)Z", "GetRemove_Ljava_lang_Object_Ljava_lang_Object_Handler")] public virtual bool Remove(Java.Lang.Object? key, Java.Lang.Object? value); ...
JavaDictionary<K,V> JavaList JavaList<T> JavaSet JavaSet 构造函数 属性 方法 Add Clear Contains CopyTo FromJniHandle GetEnumerator Remove ToLocalJniHandle JavaSet<T> JNIEnv JniHandleOwnership JNINativeWrapper JValue NamespaceMappingAttribute
Object 要删除的映射的键。 返回 Object 实现 Remove(Object) 适用于 . 的java.util.AbstractMap.remove(java.lang.Object)Java 文档 本页的某些部分是根据 Android 开放源代码项目创建和共享的工作进行的修改,并根据 Creative Commons 2.5 属性许可证中所述的术语使用。
Java.Util.Concurrent Assembly: Mono.Android.dll To be added C# [Android.Runtime.Register("remove","(Ljava/lang/Object;Ljava/lang/Object;)Z","GetRemove_Ljava_lang_Object_Ljava_lang_Object_Handler")]publicvirtualboolRemove(Java.Lang.Object key, Java.Lang.Object?value); ...