13: String a = ""; 14: a += 2; 15: a += 'c'; 16: a += false; 17: if ( a == "2cfalse") System.out.println("=="); 18: if ( a.equals("2cfalse")) System.out.println("equals");
❌ A. Compile error on line 14. ❌ B. Compile error on line 15. ❌ C. Compile error on line 16. ❌ D. Compile error on another line. ❌ E. == ✅ F. equals ❌ G. An exception is thrown
Explanation: a += 2 expands to a = a + 2. A String concatenated with any other type gives a String. Lines 14, 15, and 16 all append to a, giving a result of "2cfalse". The if statement on line 18 returns false because the values of the two String objects are the same using object equality. The if statement on line 17 returns false because the two String objects are not the same in memory. One comes directly from the string pool and the other comes from building using String operations.
13: String a = ""; 14: a += 2; 15: a += 'c'; 16: a += false; 17: if ( a == "2cfalse") System.out.println("=="); 18: if ( a.equals("2cfalse")) System.out.println("equals");
❌ A. Compile error on line 14. ❌ B. Compile error on line 15. ❌ C. Compile error on line 16. ❌ D. Compile error on another line. ❌ E. == ✅ F. equals ❌ G. An exception is thrown
Explanation: a += 2 expands to a = a + 2. A String concatenated with any other type gives a String. Lines 14, 15, and 16 all append to a, giving a result of "2cfalse". The if statement on line 18 returns false because the values of the two String objects are the same using object equality. The if statement on line 17 returns false because the two String objects are not the same in memory. One comes directly from the string pool and the other comes from building using String operations.
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The S&P 500 slumped 1.8% on Monday and Tuesday, thanks to China Evergrande, the Chinese property company that looks like it is ready to default on its more-than $300 billion in debt. Cries of the next Lehman Brothers—or maybe the next Silverado?—echoed through the canyons of Wall Street as investors prepared for the worst.
How to Buy Bitcoin?
Most people buy Bitcoin via exchanges, such as Coinbase. Exchanges allow you to buy, sell and hold cryptocurrency, and setting up an account is similar to opening a brokerage account—you’ll need to verify your identity and provide some kind of funding source, such as a bank account or debit card. Major exchanges include Coinbase, Kraken, and Gemini. You can also buy Bitcoin at a broker like Robinhood. Regardless of where you buy your Bitcoin, you’ll need a digital wallet in which to store it. This might be what’s called a hot wallet or a cold wallet. A hot wallet (also called an online wallet) is stored by an exchange or a provider in the cloud. Providers of online wallets include Exodus, Electrum and Mycelium. A cold wallet (or mobile wallet) is an offline device used to store Bitcoin and is not connected to the Internet. Some mobile wallet options include Trezor and Ledger.
