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68 lines
1.6 KiB
68 lines
1.6 KiB
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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package codetoanalyze.java.nullsafe;
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import javax.annotation.Nullable;
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public class NullFieldAccess {
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interface I {
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@Nullable Object nullable = new Object();
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Object notNull = new Object();
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}
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@Nullable Object nullable;
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Object notNull;
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static final @Nullable Object nullableStatic = new Object();
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static final Object notNullStatic = new Object();
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@Nullable Object[] nullableArray;
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Object[] notNullArray;
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NullFieldAccess() {
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nullable = new Object();
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notNull = new Object();
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nullableArray = new Object[1];
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notNullArray = new Object[1];
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}
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void testNonStaticFields() {
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Object bad = nullable;
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bad.toString(); // BAD: `bad` can be null
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Object good = notNull;
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good.toString(); // OK: `good` is not null
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}
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void testStatic() {
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Object bad = nullableStatic;
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bad.toString(); // BAD: `bad` can be null
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Object good = notNullStatic;
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good.toString(); // OK: `good` is not null
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}
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void testInterface() {
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Object bad = I.nullable;
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bad.toString(); // BAD: `bad` can be null
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Object good = I.notNull;
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good.toString(); // OK: `good` is not null
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}
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void testArray() {
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int i1 = nullableArray.length; // BAD: array can be null
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Object o1 = nullableArray[0]; // BAD: array can be null
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int i2 = notNullArray.length; // OK: arrays is not null
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Object o2 = notNullArray[0]; // OK: array is not null
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}
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}
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