Describe the relational operators in java?
Java has six relational operators which compare two numbers and return a boolean value. The relational operators are <, >, <=, >=, ==, and !=.
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x < y
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Less than
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True if x is less than y, otherwise false.
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x > y
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Greater than
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True if x is greater than y, otherwise false.
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x <= y
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Less than or equal to
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True if x is less than or equal to y, otherwise false.
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x >= y
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Greater than or equal to
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True if x is greater than or equal to y, otherwise false.
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x == y
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Equal
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True if x equals y, otherwise false.
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x != y
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Not Equal
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True if x is not equal to y, otherwise false.
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Here are a few code snippets showing the relational operators.
boolean test1 = 1 < 2; // True. One is less that two.
boolean test2 = 1 > 2; // False. One is not greater than two.
boolean test3 = 3.5 != 1; // True. One does not equal 3.5
boolean test4 = 17*3.5 >= 67.0 - 42; //True. 59.5 is greater than 5
boolean test5 = 9.8*54 <= 654; // True. 529.2 is less than 654
boolean test6 = 6*4 == 3*8; // True. 24 equals 24
boolean test7 = 6*4 <= 3*8; // True. 24 is less than or equal to 24
boolean test8 = 6*4 < 3*8; // False. 24 is not less than 24
This, thus, is an unusual use of booleans. Almost all use of booleans in practice comes within conditional statements and loop tests. You've already seen various examples of this. Earlier you saw this
if (args.length > 0) {
System.out.println("Hello " + args[0]);
}
args.length > 0 is a boolean value. In other words it is either true or it is false. You could write
boolean test = args.length > 0;
if (test) {
System.out.println("Hello " + args[0]);
}
instead. Therefore in easy situations such as this the original approach is customary. Similarly the condition test in a while loop is a boolean. When you write while (i < args.length) the i < args.length is a boolean.