Exception in thread "main" java.lang.ClassCastException:java.base/java.lang.Integer cannot be cast to java.base/java.lang.String at java.base/java.lang.String.compareTo(String.java:124) at java.base/java.util.Collections$ReverseComparator.compare(Collections.java:5140) at java.base/java.util....
unmodifiableNavigableMap(map); System.out.println("Unmodifiable Navigable Map:" + map2); map.put("key4", "JavaTpoint"); System.out.println("Unmodifiable Navigable Map after adding:" + map2); } } 輸出: Initial Map:{key1=Java, key2=Android, key3=JavaScript} Unmodifiable Navigable Map:{...
emptySortedMap(); System.out.println("Created Empty Sorted Map:"+EmpSortedMap); // try to add elements EmpSortedMap.put("1","from JavaTpoint.com"); } } 輸出: Created Empty Sorted Map:{} Exception in thread "main" java.lang.UnsupportedOperationException at java.base/java.util....
emptyMap(); System.out.println("Created Empty Map:"+EmptyMap); // try to add elements EmptyMap.put("1","from JavaTpoint.com"); } } 輸出: Created Empty Map:{} Exception in thread "main" java.lang.UnsupportedOperationException at java.base/java.util.AbstractMap.put(AbstractMap.java:209...