{"id":620,"date":"2024-01-18T15:21:00","date_gmt":"2024-01-18T15:21:00","guid":{"rendered":"https:\/\/javigomez.org\/?p=620"},"modified":"2025-09-29T20:33:34","modified_gmt":"2025-09-29T20:33:34","slug":"u06-11-arraylist-ii","status":"publish","type":"post","link":"https:\/\/javigomez.org\/index.php\/2024\/01\/18\/u06-11-arraylist-ii\/","title":{"rendered":"U06-12-ArrayList II"},"content":{"rendered":"\n<p><strong>Mostrar todo el contenido<\/strong><\/p>\n\n\n\n<p>Para mostrar todo el contenido de ArrayList se puede utilizar directamente el nombre del array<\/p>\n\n\n\n<p>System.out.printl(listaFrutas);<\/p>\n\n\n\n<p><strong>Verificar la existencia de un elemento<\/strong><\/p>\n\n\n\n<p>Puedes verificar si un elemento est\u00e1 presente en el ArrayList utilizando el m\u00e9todo contains().<\/p>\n\n\n\n<p>boolean contieneUva = listaFrutas.contains(&#8220;Uva&#8221;);<\/p>\n\n\n\n<p><strong>Conocer el \u00edndice de un elemento<\/strong><\/p>\n\n\n\n<p>El m\u00e9todo <strong>indexOf<\/strong><strong>() <\/strong>en Java es un m\u00e9todo de la clase ArrayList que se utiliza para obtener el \u00edndice de la primera ocurrencia de un elemento espec\u00edfico en la lista.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>package U6;\n\nimport java.util.ArrayList;\n\npublic class A000 {\n\n\tpublic static void main(String&#91;] args) {\n\t\t\n\t\tArrayList&lt;Integer> numeros = new ArrayList&lt;>();\n\t\tnumeros.add(4);\n\t\tnumeros.add(35);\n\t\tnumeros.add(48);\n\t\t\n\t\tif (numeros.contains(39)) {\n\t\t\tSystem.out.println(\"Encontrado\");\n\t\t}\n\t\telse{\n\t\t\tSystem.out.println(\"No encontrado\");\n\t\t}\n\t\t\n\t}\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>package U6;\n\nimport java.util.ArrayList;\n\npublic class A000 {\n\n\tpublic static void main(String&#91;] args) {\n\t\t\n\t\tArrayList&lt;Integer> numeros = new ArrayList&lt;>();\n\t\tnumeros.add(4);\n\t\tnumeros.add(35);\n\t\tnumeros.add(48);\n\t\t\n\t\tint ind=numeros.indexOf(48);\n\t\tif (ind&lt;0)\n\t\t\tSystem.out.println(\"No encontrado\");\n\t\telse\n\t\t\tSystem.out.println(\"El elemento esta en la posicion: \" + ind);\n\t\t\n\t\tSystem.out.println(numeros);\n\t\t\n\t\t\n\t\t\n\t}\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>package U6;\n\nimport java.util.ArrayList;\nimport java.util.Collections;\n\npublic class A000 {\n\n\tpublic static void main(String&#91;] args) {\n\t\t\n\t\tArrayList&lt;Integer> numeros = new ArrayList&lt;>();\n\t\tnumeros.add(4);\n\t\tnumeros.add(35);\n\t\tnumeros.add(48);\n\t\tnumeros.add(12);\n\t\tnumeros.add(7);\n\t\t\n\t\tint ind=numeros.indexOf(48);\n\t\tif (ind&lt;0)\n\t\t\tSystem.out.println(\"No encontrado\");\n\t\telse\n\t\t\tSystem.out.println(\"El elemento esta en la posicion: \" + ind);\n\t\t\n\t\tSystem.out.println(numeros);\n\t\t\n\t\tfor (int i=0;i&lt;numeros.size();i++)\n\t\t\tSystem.out.println(\"El elemento \" + i + \" es \" + numeros.get(i));\n\t\t\n\t\tCollections.sort(numeros);\n\t\t\n\t\tSystem.out.println(\"************\");\n\t\tfor (int i=0;i&lt;numeros.size();i++)\n\t\t\tSystem.out.println(\"El elemento \" + i + \" es \" + numeros.get(i));\n\t\t\n\t\t\n\t}\n}\n<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Java U6 12 ArrayList II\" width=\"1200\" height=\"675\" src=\"https:\/\/www.youtube.com\/embed\/JRjGZ7lKv3o?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; 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