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String str = "";
Object o = new Object();
System.out.println(String.class.isInstance(o));
System.out.println(String.class.isInstance(str));
System.out.println(String.class.isAssignableFrom(Object.class));
System.out.println(Object.class.isAssignableFrom(Object.class));
System.out.println(Object.class.isAssignableFrom(String.class));
false
true
false
true
true